How to make a DFF mandatory based on the natural account value chosen in the journal line string?

Organization Name (Required - If you are an Oracle Partner, please provide the organization you are logging the idea on behalf of):

S&P Global

Description (Required):

We want users to populate the DFF value mandatorily if they try to use a specific value of natural account while making a journal line entry

Use Case and Business Need (Required):

Once a journal is created using a specific FX account or cash account, we want a DFF (Descriptive Flexfield) field to be mandatory for any user entering the journal data.

However, since this requirement applies only to specific account values, we cannot make the DFF field mandatory for all journal entries by default.