Harold H. Heidingsfelder signed a credit agreement as vice president of J. O. H. Construction Co. for a line of credit with Pelican Plumbing Co. The credit agreement contained the following language:
In consideration of an open account privilege, I hereby understand and agree to the above terms. Should it become necessary to place this account for collection I shall personally obligate myself and my corporation, if any, to pay the entire amount due including service charges (as outlined above terms) thirty-three and one-third (331/3%) attorney’s fees, and all costs of collection, including court costs.
Signed [Harold H. Heidingsfelder]
Company J. O. H. Construction Co., Inc.

When J. O. H. Construction failed to make payment, Pelican, claiming it was a holder of a negotiable instrument, sued Heidingsfelder to hold him personally liable for his failure to indicate a representative capacity on the credit agreement. He claims that a credit application is not a negotiable instrument and that he could not be held personally liable. Is he right? [Pelican Plumbing Supply, Inc. v J. O. H. Construction Co., Inc., 653 So2d 699 (La)]