What does it do? Defines a CDS parameter called pname in one of the following:
Parameter list of a CDS view entity
Parameter list of a CDS analytical projection view
Parameter list of a CDS table function
Parameter list of a CDS hierarchy
Parameter list of a CDS custom entity
Parameter list of an CDS abstract entity
Parameter list of a ABAP_CDS_V1_VIEW The name pname must comply with the naming rules for names. Furthermore, pname cannot contain any slash (/) characters and cannot be a reserved name in ABAP Dictionary. The name pname must be unique and be located in the namespace of the elements and exposed CDS associations of the current CDS entity. In table functions, the reserved name connection cannot be used. All reserved names that cannot be used are specified in the DDIC database table TRESE . The evaluation of names is not case-sensitive. Blanks in the comma-separated parameter list are ignored and can be omitted. Each parameter must be typed with an elementary data type. All data types listed in topic Typing are allowed, except for abap.accp, abap.geom_ewkb, abap.rawstring , and abap.string. In CDS view entities and CDS table functions, parameters can also have data type abap.string. A CDS SQL entity for which CDS parameters are defined as input parameters can be used as
data source or in a path expression of a different CDS view entity or ABAP_CDS_V1_VIEW
A data source of a SELECT statement from AB_SQL in ABAP In these cases, each input parameter must be assigned a suitable actual parameter whose value is then used in the operand positions in which the parameter is specified. The actual parameters are assigned using a parenthesized comma-separated list as follows: ... cds_entity( pname1 : act1, pname2 : act2, ...) ..., This list must be specified directly after the name of the view when using an entity with parameters (both within the CDS DDL in ABAP CDS and in AB_SQL ). In AB_SQL , an equal sign (=) is used instead of a colon (:).
