Need a script to change the current inventory organization

Hi,

I try to set the current inventory organization (as the function change organization MRP) by script from a form.

I have built a form that display a multi-org inventory items list, and a button that call the standard RCV receiving form with find information filled with data relevant to my custom form record line.

The standard receiving form need to have the current organization value set before to be opened. and I want to set this value before the call.

I don't know how to do ? is it possible to use global variable or api in order to set this value ?