SAP Message USMD1752 - Data model &1, entity type &2: Prefix is invalid

Diagnosis
Prefixes for temporary keys must fulfill the following conditions:

  • They are not allowed to be blank.

  • They are not allowed to begin with a space.

  • For entity types that have solely internal key assignment, the prefix is
    • not allowed to be numeric.

    System Response
    The system does not save the data.

    Procedure
    Change the prefix.