Checking Whether a Field Symbol is Assigned (SAP Library

Checking Whether a Field Symbol is Assigned

To check whether a field is assigned to a field symbol, use the following logical expression:

... <FS> IS ASSIGNED.

The expression is false if the field symbol <fs> is not explicitly assigned to a field, that is, in the following cases:

Directly after you have declared a field symbol without a particular structure When you declare a field symbol with a particular structure, a data object is assigned to it straight away. The expression is false for untyped field symbols before you have assigned a field to them in an ASSIGN statement, even though they point to the predefined data object SPACE.

After UNASSIGN <FS>.

When a local field that was assigned to <FS> no longer exists.

When <FS> points to a global parameter of the interface of a function module that is inactive.

Example

FIELD-SYMBOLS <FS>.
DATA TEXT(10) TYPE C VALUE 'Assigned!'.
ASSIGN TEXT TO <FS>.
IF <FS> IS ASSIGNED.
WRITE <FS>.
ENDIF.

The output is:

Assigned!

since the logical expression in the IF statement is true.