HI Marius.
I am checking points mentioned by you and DB49 but can you give some more detail on point 14. You have mentioned "14. Switch from GATP to ATP check (for sale orders)" , is there any configuration node, data setup which triggers ATP check in APO and need to be modified for switching ATP to ECC?
I thought Integration Model is only responsible for directing ATP check to APO. So further detail on point 14 will be helpful.
Thanks,
Devang