Thank you for your quick reply.
I still have some questions:
I have the table InventoryControlLocation with all possible locations.
But how do I connect the values in this table to a specific item?
For example: a customer orders article X which is stored in LocationSite Y. I can see this information in the item list in QB.
I create the salesorder and corresponding salesorderlines in method.
But how do I get the Information in method, that Item X is stored in LocationSite Y so that I can insert it into salesorderline? I don't find any connection of the tables item and InventoryControlLocation.
Or do I have to turn on advanced inventory in method? (Step one of your suggestion)