Diagnosis
In the function module, an attempt was made to access a field of thestructure. The function module does not support access to the structure(or access to the requested field of the structure).

Procedure
Determine which expression causes this error. To do so:
Call transaction BRF.
In the toolbar of the navigation tree, choose the arrow on the right,next to |@13@ with the quick info Find BRF Object and thenFind Expression.
The system displays the dialog screen Find BRF Expression.
Call the input help for the Expression field.
On the next dialog screen, choose one of the following tab pages:
Field of a Structure
Field of a Row of an Internal Table
Check the expressions of the structure.
To do so:
Choose an expression by double-clicking.
Note: If the system opens the expression in display mode, switchto change mode.
In the Administrative Data section, choose |@38@ with the quickinfo Check.
Analyze the messages that are displayed.