I have done something like this in my project, see if it is use-full to you

Make Two Picking types one is for Intra-WH-OUT and other one is Intra-WH-IN

Intra-WH-OUT - They know the some of the quantity to out from warehouse to warehouse transfer not for delivery.

       set source_location(main stock) and destination location(send virtual location )

Intra-WH-IN - They know the some of the quantity is ready to receive from warehouse  not for any received from vendor.

     set source_location(receive virtual location ) and destination location(main stock)
and on Intra-WH-OUT creation make chain of stock move to Intra-WH-IN stock move.

This should be in done in your both warehouse if you want Both-Way transfer.

In view of the product you have link Request Procurement.

UPADTE:

or you create Internal transfer (stock move) from location A/Stock to location B/Stock

I got what you want, and I'll try asking the same question in other words.
Suppose I'm one of the warehousemen (e.g for warehouse A), and want to move punch of products from warehouse A to warehouse B, and/or vise versa. And I want to validate the picking in/out my warehouse myself, i.e. the draft move should be in red color and when I validate it turn into normal black color.
On the other hand, the other warehouseman (for warehouse B) wants to do the same, but in his area.

What should we do?
Right?