The statement of work usually controls, because it shows who receives the services and what they are. The support letter must be rewritten to match it, not the other way around.
Reconcile the contract and the letter before travel
Officers read the underlying agreement to check the letter’s claims. If the statement of work describes workflow redesign and system specification while the letter calls the applicant a project coordinator, the profession is in doubt and the application can be refused on that inconsistency alone. Start from the contract: list the deliverables, the on-site duration and the client’s obligations, then have the Canadian corporation issue a letter that repeats those facts in the language of the Computer Systems Analyst listing. Attach the diploma, the experience letters and the corporation’s incorporation documents, and keep any earlier versions of the letter out of the package. Where a document is in French, a certified English translation accompanies it. One coherent set of papers is more persuasive than a longer package with contradictions.
The first review should make a document-to-claim list: passport for citizenship, credential evidence for the professional listing, and the agreement for duties, place, payor, and end date. A résumé describes experience but rarely settles a credential requirement by itself. Where a Canadian company supplies the services, invoices and corporate records should match the letter so the officer can see who employs the professional. Hypothetical example: a management consultant is retained to redesign a museum's ticketing process. A signed statement of work identifying the deliverables resolves whether the assignment is consulting rather than an undefined staff vacancy.