Proprietor with two firms can give Unsecured Loan to other firm?

A proprietor with two separate firms, Firm A and Firm B, is seeking advice on whether Firm A can provide an unsecured loan to Firm B using its existing credit limit. Both firms are registered under the same PAN number but have different GST registrations and operate in different sectors (sales vs. services). The proprietor has already been advised against clubbing credit limits by their bank.