how to prevent blank timecards from getting submitted for all time types

Summary:

Currently blank Timecards are being saved and submitted. we tried using WFM_PERIOD_MINIMUM_TIME_ENTRY_RULE_AP to stop blank timecards from being submitted but it is also blocking timecards from being submitted for unit based timecards as well as the start time and stop time is left blank for such time types which we do not want.

Is there a way to prevent blank timecards from being submitted but it wont error out for unit based time types?

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