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ARTICLE • IS ABAP_RELAT_EXPR
rel_exp - Predicate Expressions
Syntax ... {operand IS [NOT] INITIAL} | {ref IS [NOT] BOUND} | {<(><<)>fs> IS [NOT] ASSIGNED} | {para IS [NOT] SUPPLIED} ... .
Effect A predicate expression uses the predicate operator IS to get a logical value from the state of an operand.
Notes
No operand of the potential predicate expressions is a general expression position. No predicate expression can be applied to a calculation expression.
The predicate expression IS [NOT] REQUESTED is obsolete and was replaced by IS [NOT] SUPPLIED.