Approves not populating using transformmap

Import data using transform map, the data was loaded successfully in customised table. Loaded data is in draft state, now I want to move draft to published manually. While moving the states, should accept approvers approval then only record will go to the published state. 

Now the issue is approvers not assigning it is showing empty field. This approver field is in sysapproval_approver table. 

while creating record manually approvers getting in approvers field but using transform map not assigned approvers. I written transform map scrip also but not worked.

can you please give me the suggestions on this. Thank in advance