SAP Message 50074 - Expansion of source element &3.&4 not possible (target elem. comp. &1.&2)

Diagnosis
An error has occurred that has prevented further processing. This ismost likely due to a Customizing error.
The following information should enable a specialist to locate theproblem so that it can be resolved more quickly.
The source of the obligatory target element component &V1&.&V2&could not be resolved during container transformation.
This concerns the source element/literal:
&V3&
Expansion rule:
&V4&

Procedure
Contact your system administrator specifying the error situationconcerned.