How To Fix WD321 - When ref. date/time not equal to expression, time interval must be stated

WD321 - Overview

• Message type: E = Error

• Message class: WD - Workflow definition

• Message number: 321

• Message text: When ref. date/time not equal to expression, time interval must be stated

What causes this issue?

The field &V1& in the referenced table structure &V2& has an invalid
data type.

How to fix this error?

Please choose a structure which only contains fields with valid data
types.
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.

Error message extract from SAP system. Copyright SAP SE.

WD321 - Details

• SAP Error Message:
  WD321 – When ref. date/time not equal to expression, time interval must be stated
  
  
  Cause:
  This error occurs in SAP Web Dynpro applications when a reference date/time is used in an expression or condition, but the corresponding time interval is missing or not specified. Essentially, the system expects a time interval to be defined whenever the reference date/time does not exactly match the expression's date/time value.
  In other words, if you are comparing or working with date/time values and the reference date/time differs from the expression's date/time, SAP requires you to specify a time interval to clarify the range or duration for the comparison or calculation.
  
  When does it typically occur?
  
  When defining filters or conditions involving date/time fields in Web Dynpro components.
  When using expressions or conditions that compare date/time values but omit the time interval.
  In scenarios involving dynamic date/time calculations or validations where the system needs a time interval to process the