Hi,
I did not post before, becasue I was not sure if it was the right option to my problem.
But I can say now that function /SAPAPO/RRP_ORDER_CREATE_FINDS made the trick.
Unfortunately the Bapis could not help me, as we said, we have not an unique resource for a production version.
So if someone has to specify the resource when creating the planned order and the production version is not enough....
Use it, with is_mpsched parameter filled. PPT1 internally is using the same one really.
Of course /SAPAPO/RRP_SIMSESSION_CREATE & /SAPAPO/RRP_SIMSESSION_GET are needed before it. And afterwards: /SAPAPO/RRP_COMMIT.
Thanks to all for the support!
Regards!