Cannot Activate PO Tab When Using Project Class Code DFF Attributes 1 to 15 due to error

Summary:

Cannot Activate PO Tab When Using Project Class Code DFF Attributes 1 to 15 due to error: "The account rule **** in the account definition XXXX uses the source Project Class Code Descriptive Flexfield Attribute 1 that isn't assigned to account type Charge Account"

Content (required):

The account rule **** in the account definition XXXX uses the source Project Class Code Descriptive Flexfield Attribute 1 that isn't assigned to account type Charge Account

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

21D

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

Receiving this error when activating the TAB for Purchasing. The same Account rule works fine for the Project Miscellaneous cost. Tried using the attributes from 1 to 15 and all of the attributes are ending in the same error. Already reviewed the