Cannot Create IMT if Supplier is made mandatory on "Enter Requisition Line" page

Content

Hi,

We have personalized the "Enter Requisition Line" page to make supplier mandatory.

However, if we change the source from Supplier to Internal, to create IMT, we cannot add any items in the cart and the page refreshes. When we disabled the personalization, we were able to create IMT requisition successfully. 

Seems like making the supplier field mandatory is being considered in IMT page as well (even though it is not visible in the front end) and stopping us from adding the item into the cart.

Is there a way by which (using groovy script or something) we can enable the personalization just for Supplier source and not for Internal source.