Auto batch # assignment in during SO Invoice Import

I'm on MAS 90 4.05 and using Vi to import invoices from a .csv file and cannot get the thing to auto assign the next batch number in the system.

 

I've tried in including the batch# in the source file and pointing the batch# field to a blank column in the source file without any luck.

 

I am able to turn off batching and import without a problem.

 

Any ideas are greatly appreciated!!