Reference RFQ - not copying account assignment details for limit

Hello,

Please read below system behaviour what I understood.

We r creating Service RFQ with reference to Purchase requisition(service).

Account assignment details for service and limit copied to further Purchase order(service) ( this is fine)

Now suppose we create RFQ by copying to existing RFQ and when we create Purchase order it is asking for "account assignment for limit".

Copied RFQ is linked with main purchase requisition and details updated in table and status tab.

My question is why system not copying account assignment details for Limit only ? as it copies same for service.

Is there any additional configuration for copying details from limit tab to purchasing documents?

Kindly advise.

Thank You,

Guruprasad