Integration manager eConnect Error Cannot insert the value NULL into column FAYEAR, table dbo.FA00902 column does not allow nulls

Dear

I am running integration manager eConnect to migrate fixed Assets and I am getting the below error

Opening source query...

Establishing source record count...

Beginning integration...

DOC 1 ERROR: Cannot insert the value NULL into column 'FAYEAR', table 'dbo.FA00902'; column does not allow nulls. INSERT fails.

The statement has been terminated.

can you please advise which field is missing so I can place it as constant in the integration manager ,

thank you