ABAP Keyword Documentation → ABAP - Dictionary → ABAP CDS in ABAP Dictionary → ABAP CDS - Data Definitions → ABAP CDS - DDL for Data Definitions → ABAP CDS - DEFINE VIEW → ABAP CDS - SELECT → ABAP CDS - SELECT, Built-In Functions → ABAP CDS - Special Functions → ABAP CDS - Conversion Functions
ABAP CDS - Conversion Functions for Units and Currencies
Other versions:
7.31 | 7.40 | 7.54
Syntax
... UNIT_CONVERSION( p1 => a1, p2 => a2, ... )
| CURRENCY_CONVERSION( p1 => a1, p2 => a2, ... )
| DECIMAL_SHIFT( p1 => a1, p2 => a2, ... ) ...
Variants
1. ... UNIT_CONVERSION( p1 => a1, p2 => a2, ... )
2. ... CURRENCY_CONVERSION( p1 => a1, p2 => a2, ... )
3. ... DECIMAL_SHIFT( p1 => a1, p2 => a2, ... )
Effect
Conversion functions for converting between units and between currencies in a CDS view. The functions have keyword parameters p1, p2, ... (some of which are optional), to which the actual parameters a1, a2, ... must be assigned when called using =>.
Variant 1
... UNIT_CONVERSION( p1 => a1, p2 => a2, ... )
Effect
The function UNIT_CONVERSION performs a unit conversion for the value passed to the formal parameter quantity. The result has the data type QUAN with the length 31 and 14 decimal places. The unit conversion is performed on the basis of the client-specific rules saved in transaction CUNI and in the database tables T006... of the package SZME.
The table below shows the actual parameters p1, p2, ... and their meaning.
| Formal Parameter | Optional | Meaning | Data Type | Actual Parameter |
|---|---|---|---|---|
| quantity | - | Initial value | QUAN,DEC,INT1,INT2, INT4, FLTP | Field of a data source, parameter |
| source_unit | - | Source currency from column MSEHI of database table T006 | UNIT | Field of a data source,literal, parameter |
| target_unit | - | Target unit from column MSEHI of database table T006 | UNIT | Field of a data source,literal, parameter |
| client | X, - | Client whose rules are used to perform the unit conversion. Optional (if the current data source is client-specific). Default: Content of the client column of the current row | CLNT | Field of a data source,literal, parameter |
| error_handling | X | Error handling. If "FAIL_ON_ERROR" (default value), an error raises an exception; if "SET_TO_NULL", the result is reset to thenull value; if "KEEP_UNCONVERTED", the source value is not changed. | CHAR with length 20 | Literal |
Note
The precision of the result of the unit conversion depends on the database platform. The highest precision is achieved on databases that support decimal floating point numbers. Due to rounding, the result can be different from a unit conversion performed using ABAP methods, such as a standard function module.
Example
The following CDS view calls a unit conversion in the SELECT list for the column DEC3 of the database table DEMO_EXPRESSIONS. The source unit is a literal that is cast to the required type. The target unit must be passed as a parameter. In the event of an error, e.g. if a conversion between the entered units is impossible, the result is reset to zero.
@AccessControl.authorizationCheck: #NOT_REQUIRED
define view demo_cds_unit_conversion
with parameters
to_unit :abap.unit( 3 )
as select from
demo_expressions
{
id,
dec3 as original_value,
cast( 'MI' as abap.unit(3) ) as original_unit,
unit_conversion( quantity => dec3,
source_unit => cast( 'MI' as abap.unit(3) ),
target_unit => :to_unit,
error_handling => 'SET_TO_NULL' ) as converted_value,
:to_unit as converted_unit
}
The program DEMO_CDS_UNIT_CONVERSION accesses the view in a SELECT
statement. Here, the target unit is passed to the parameter in question. As a comparison, the same conversion
is also performed using the function module UNIT_CONVERSION_SIMPLE. As
prerequisite for the example, the units and their conversion rules must be available in the corresponding database tables.
Variant 2
... CURRENCY_CONVERSION( p1 => a1, p2 => a2, ... )
Effect
The function CURRENCY_CONVERSION performs a currency conversion for the value passed to the formal parameter amount. The result has the data type CURR with the same technical attributes as the actual parameter passed to amount. The currency conversion is performed on the basis of the client-specific rules saved in the database tables TCUR... of package SFIB. These rules can be edited using transaction OB08.
The table below shows the actual parameters p1, p2, ... and their meaning.
| Formal Parameter | Optional | Meaning | Data Type | Actual Parameter |
|---|---|---|---|---|
| amount | - | Initial value | CURR | Field of a data source, parameter |
| source_currency | - | Source currency from column WAERS of database table TCURC | CUKY | Field of a data source,literal, parameter |
| target_currency | - | Target currency from column WAERS of database table TCURC | CUKY | Field of a data source,literal, parameter |
| exchange_rate_date | - | Exchange rate date for column GDATU of database table TCURR | DATS | Field of a data source,literal, parameter |
| exchange_rate_type | X | Exchange rate type from column KURST of database table TCURR, default value: "M" | CHAR with length 4 | Literal, parameter |
| client | X, - | Client whose rules are used to perform the currency conversion. Optional (if the current data source is client-specific). Default: Content of the client column of the current row | CLNT | Field of a data source,literal, parameter |
| round | X | If "X" (default value), the intermediate result of the conversion is rounded to the end result using commercial rounding; else it is truncated | CHAR | Literal |
| decimal_shift | X | If "X" (default value), the decimal places of the source value are moved as specified by the decimal places of the source currency (see below). | CHAR | Literal |
| decimal_shift_back | X | If "X" (default value), the decimal places of the result are moved as specified by the decimal places of the target currency (see below). | CHAR | Literal |
| error_handling | X | Error handling. If "FAIL_ON_ERROR" (default value), an error raises an exception; if "SET_TO_NULL", the result is reset to thenull value; if "KEEP_UNCONVERTED", the source value is not changed. | CHAR with length 20 | Literal |
The literals #cdsboolean.TRUE, #cdsboolean.true, #cdsboolean.FALSE, and #cdsboolean.false can also be specified for the input parameters round, decimal_shift, and decimal_shift_back with the domain prefix CDSBOOLEAN (case-sensitive) or the literals 'true' or 'false' (not case-sensitive). Internally, these literals are handled like the values "X" or " ".
Handling the Decimal Places
- The value passed is rounded to two decimal places before it is converted.
- Before the conversion, the value passed is multiplied by 10 to the power of the number of decimal places of the source currency.
- If the value "X" or "TRUE" is passed to the parameter decimal_shift, the value passed is multiplied by 10 to the power of two minus the number of decimal places of the source currency before it is converted.
- If the value "X" or "TRUE" is passed to the parameter decimal_shift_back, the result is divided by 10 to the power of two minus the number of decimal places of the target currency before it is converted.
- After the conversion, the result is divided by 10 to the power of the number of decimal places of the target currency.
Note
- The conversion is performed on the database, which means that part of the calculation takes place using different rounding rules from ABAP. No matter how the conversion is made, the same results cannot be expected as when using standard function modules for currency conversion, since these modules are generally less precise and round the intermediate results accordingly.
- The parameter decimal_shift is intended to set the source value to the number of decimal places of the source currency before the conversion. This assumes that its technical type, CURR, has two decimal places as usual. The parameter decimal_shift_back is intended to perform the reverse operation.
- If the technical type CURR of the source value does not have two decimal places, the function CURRENCY_CONVERSION may display unexpected behavior.
Example
The following CDS view calls a currency conversion in the SELECT list for the column AMOUNT of the database table DEMO_PRICES. The target currency must be passed as a parameter. In the event of an error, e.g. when a currency is not available, the result is reset to zero.
@AccessControl.authorizationCheck: #NOT_REQUIRED
define view demo_cds_curr_conv
with parameters
to_currency :abap.cuky( 5 ),
exc_date :abap.dats
as select from
demo_prices
{
id,
currency_conversion( amount => amount,
source_currency => currency,
round => 'X',
target_currency => :to_currency,
exchange_rate_date => :exc_date,
error_handling => 'SET_TO_NULL' ) as amount,
:to_currency as currency
}
The program DEMO_CDS_CURRENCY_CONVERSION accesses the view in a SELECT
statement. The target currency is passed here. As a comparison, the same conversion is also performed
using the function module CONVERT_TO_LOCAL_CURRENCY. As prerequisite for the example, the currencies and conversion rules must be available in the corresponding database tables.
Variant 3
... DECIMAL_SHIFT( p1 => a1, p2 => a2, ... )
Effect
The function DECIMAL_SHIFT sets the decimal separator of the value that is passed to the formal parameter amount in accordance with a currency. The result has the data type CURR with the length 31 and 14 decimal places. Its value is produced by multiplying the input parameter rounded to two decimal places by 10 to the power of two minus the decimal places defined by the currency passed.
Possible currencies and their decimal places are based on the database tables TCUR... of the package SFIB.
| Formal Parameter | Optional | Meaning | Data Type | Actual Parameter |
|---|---|---|---|---|
| amount | - | Initial value | CURR | Field of a data source, parameter |
| currency | - | Currency from column WAERS of database table TCURC; the associated decimal places determined from the column CURRDEC of TCURX | CUKY | Field of a data source,literal, parameter |
| error_handling | X | Error handling. If "FAIL_ON_ERROR" (default value), an error raises an exception; if "SET_TO_NULL", the result is reset to thenull value; if "KEEP_UNCONVERTED", the source value is not changed. | CHAR with length 20 | Literal |
Note
If the type of the actual parameter passed to amount has two decimal places, its value is set to the number of decimal places of the passed currency.
Example
In the SELECT list, the following CDS view sets the decimal separator for column AMOUNT of database table DEMO_PRICES to between 0 and 5, according to the relevant currency. The column AMOUNT has two decimal places, which means that the decimal places are determined directly by the passed currencies. In the event of an error, e.g. when a currency is not available, the result is reset to zero.
@AccessControl.authorizationCheck: #NOT_REQUIRED
define view demo_cds_decimal_shift
as select from
demo_prices
{
id,
@Semantics.amount.currencyCode:'currency'
amount as original,
@Semantics.currencyCode
currency,
decimal_shift( amount => amount,
currency => cast( '0 ' as abap.cuky(5) ),
error_handling => 'SET_TO_NULL' ) as shift_0,
decimal_shift( amount => amount,
currency => cast( '1 ' as abap.cuky(5) ),
error_handling => 'SET_TO_NULL' ) as shift_1,
decimal_shift( amount => amount,
currency => cast( '2 ' as abap.cuky(5) ),
error_handling => 'SET_TO_NULL' ) as shift_2,
decimal_shift( amount => amount,
currency => cast( '3 ' as abap.cuky(5) ),
error_handling => 'SET_TO_NULL' ) as shift_3,
decimal_shift( amount => amount,
currency => cast( '4 ' as abap.cuky(5) ),
error_handling => 'SET_TO_NULL' ) as shift_4,
decimal_shift( amount => amount,
currency => cast( '5 ' as abap.cuky(5) ),
error_handling => 'SET_TO_NULL' ) as shift_5
}
The program DEMO_CDS_DECIMAL_SHIFT accesses the view in a SELECT
statement. As prerequisite for the example, the currencies and their number of decimal places must be available in the corresponding database tables.