Cost Amount (Non- Invtbl.)

Dear All,

Can you please suggest me and share the result on my below question.

Item Ledger Entry , if we book purchase invoice by item charge against shipment no then amount display positive in Cost Amount (Non-Invtbl.). What will be the correlation with other entries or effect in reports.

In India after GST Patch in Nav 2016 , same amount is showing in negative in item ledger entry.

So, Please guide me entry should be in +ve or -v?

Thanks