SAP Message USMD1016 - Data model &1, entity type &2, relat. &3: Data element &4 is invalid

Diagnosis
The data element must have the same technical properties as the dataelement assigned to the from-entity type.

System Response
The data model cannot be saved.

Procedure
Remove the data element or specify a data element that fulfills thedefined prerequisite. If no data element is specified, the system usesthe data element that is assigned to the from-entity type.