Is there any way in TAB rule to derive different charge account between internal and external PR?

Summary:

Hi Guru,

We are trying to set different charge account on PR when the source type is Inventory and Supplier, unfortunately in the TAB rule the source type is not an available source, is there any other way to do the config in the tab Rule?(we tried to determine the charge account by where the supplier is empty or not but business said at the time of creating PR they don't know the supplier yet)

Content (please ensure you mask any confidential information):

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):