HSDL not working after 19B upgrade which was working fine before.

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Hello Team

HSDL for new Hire template which was working before is not working anymore. Getting below error. Anyone has come across this issue  ?

Getting this complete error for each row. This was working fine, Got 19B last week and facing this issue.

The line for component Assignment with instruction MERGE does not include values that define a unique reference to the record., The line for component AssignmentWorkMeasure with instruction MERGE does not include values that define a unique reference to the record., The line for component AssignmentWorkMeasure with instruction MERGE does not include values that define a unique reference to the record., The line for component Contract with instruction MERGE does not include values that define a unique reference to the record., The line for component WorkTerms with instruction MERGE does not include values that define a unique reference to the record.