A licensee may undertake to perform landscape architectural assignments only when qualified to do so by education or experience, or both. If the competence of a licensee to perform an assignment is questioned, the Board either upon request of the licensee, or by its own motion, may require the licensee to submit to a formal or informal inquiry by or on behalf of the Board. A licensee may sign or seal landscape architectural documents only if the: Licensee is competent in the subject matter of those documents by virtue of education or experience, or both; or Documents were prepared under the licensee's direction as principal by an individual competent in the subject matter of those documents by virtue of education or experience, or both. When using the seal, a licensee shall affix the licensee's signature immediately adjacent to the impression of the seal.