SAP Message WD321 - When ref. date/time not equal to expression, time interval must be stated

Diagnosis
The field &V1& in the referenced table structure &V2& has an invaliddata type.

Procedure
Please choose a structure which only contains fields with valid datatypes.
Valid data types are:
ACCP,,Posting period
CHAR,,Character string
CLNT,,Client
CUKY,,Valid currencies
DATS,,Date
LANG,,Language key
NUMC,,Number sequence
TIMS,,Time
UNIT,,Unit of measure
Further information can be found in the Data Dictionary.