How to use a Cost Management source in Purchasing SLA rules?

Hello Oracle Experts!

There is a field in the master item called "User Item Type".

The business wants the charge account of the purchase orders to be related to this field.

So what I did was create a Mapping Set "MP_TEST" and added the inventory organization and the requested field "Item Type" as sources, and I was able to add this new mapping set to my account rule without any issues.

However, when I try to activate my transaction account definition, I get the following error:

"The mapping set MP_TEST in the account definition XXXX uses the source Item Type which isn't assigned to the account type Charge Account."