Custom Cost Center on Purchase Requisition created through Work Order

Hello Experts,

When we create a Work Order(IW31) and Purchase Requisition from it, PR will not contain(will not display) the Cost Center(KOSTL).

I am trying to add Cost Center through Enhancement/Customer Exits. I have found two exits which I thought might be useful.

However, looking at these exits, it does not seem like we can return KOSTL. It is not allowed either in Export or Changing parameters.

Has anybody worked on these exits or similar requirement? Please share your comments or suggestions.

Thanks.