HSDL Error - The WorkTermsSDO attribute value is required. You must enter a value.

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Hi All,

I am trying to create an HSDL (new hire) for the first time and getting below error 

The WorkTermsSDO attribute value is required. You must enter a value., The line for component Assignment with instruction MERGE doesn't include values that define a unique reference to the record. Include values for at least one of the supported keys., The line for component WorkTerms with instruction MERGE doesn't include values that define a unique reference to the record. Include values for at least one of the supported keys.

I do not see any attribute "WorkTermsSDO" in the available attributes section.