ASSIGN_STRUCTURE_ILLEGAL_CAST SAP ABAP Runtime Error assign structure illegal cast

ASSIGN_STRUCTURE_ILLEGAL_CAST is an ABAP runtime error which you may come across when using or developing within an SAP system. See below for the standard details explaining what it means and how you can avoid or fix this runtime error.

Short Dump Classification: A - ABAP Programming Error

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ASSIGN_STRUCTURE_ILLEGAL_CAST ABAP Runtime Error

Please see abap error for more details about the possible cause of this runtime error and how it could be avoided.

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Error at ASSIGN with structured field symbol in program <runtime parameter>. Please see abap error for more details about the possible cause of this runtime error and how it could be avoided.

The error occurred in a statement in the form ASSIGN f TO .
Field symbol was created with FIELD-SYMBOLS STRUCTURE ...
The type of field f or the type of the field symbol contains data references, object references, strings or internal tables as components. These components must match exactly as far as their position (offset) and their type are concerned.
This is not the case here. Please see abap error for more details about the possible cause of this runtime error and how it could be avoided.