movement type for 542+601

Hi experts

We need to post GI from special stock O (stock provided to vendor) to customer with movement type 601.

My questions is: Is it possible to post issue goods for customer from special stock O?

I see in transaction OMJJ that special stocks for movement type 601 are E,Q,K. Can we here add the special stock O?

If not what should we do to can post GI from vendor stock to customer?