Proforma invoice is not transferred to GTS

Hi Experts,

We have working client for ECC and GTS. It is copied to new clients. When I am doing the functionality check, proforma invoice is not transferred to GTS in new clients from ECC. It is working in old clients. Sales order and deliveries are transferred to GTS. Only problem with proforma invoice. It is an export document. I checked all the configuration in both clients, looks exactly the same. I could not find out the reason. I checked with ABAPer and could not figure it out. Your help is much appreciated.

Regards,

Manohar.