Need to get table name for contract entry subpage

I am creating a sql Query. I have to join contract entry page and the PO from contract page. Trying to get the sql which can find the total released amount on the contract entry page is same as the total amount of all PO for each contract. Contract entry subpage CNTRCT_HDR_SBP is using work fields and that we cannot pull in SQL developer. Is there any other table which will have the release amount fields in different table so that I can join the query.