Importing Purchase agreements using Excel Add ins

Hi 

I am trying to import purchase agreements using Excel add in.   I have used "AgreementLine" and "PurchAgreementHeader" tables.I am getting the below error

Field 'Agreement header record ID' must be filled in.
Function AgreementHeader.getModuleType has been incorrectly called.
Document Generic document could not be created. Error details: Function AgreementHeader.getModuleType has been incorrectly called.

I couldn't find the field Agreement header record ID in the tables that I am using for the import. I have added all the fields relevant to  'Agreement header record ID' like 'Agreement header record ID.Name, Document title' but still I am facing the issue.
Could you please add your inputs to figure out the issue.

Thanks