State the reason for adding a source
Supply continuity, a new process requirement and a performance problem are different reasons to evaluate another manufacturer. Identify the actual objective so the trial is not asked to prove something it was never designed to address. Record which application and product code are in scope.
Keep the incumbent approval intact while reviewing a candidate. Introducing another source does not require treating every existing specification as wrong, nor does it justify calling the new material equivalent before it has been evaluated.
Preserve a useful baseline
Use a representative feed and an identified current-product control. Record the preparation conditions for each product, including differences required by the proposed instructions. Equal dry mass alone does not prove an equal usable stock or an equivalent operating condition.
State the dose basis and the relevant separator outcome. If the feed changes during the comparison, preserve the timing and describe how that limits the conclusion. A comparison made across unrelated operating periods may require a repeat.
Approve the operating conditions, not only the code
A promising candidate may need a different concentration, make-down arrangement or machine setting. Assess whether those requirements are practical before assigning a procurement approval. A product that works only under unavailable conditions is not a ready replacement.
Document the acceptable outcome and any restriction on use. The qualification sequence separates sample screening from first-order release and repeat supply. A bounded trial should not silently become an unlimited approval.
Keep the two supply records separate
Retain manufacturer identity, sample code, preparation method and documents for each source. Do not combine remnants or substitute one code under another label during qualification. Separate records make later discrepancies easier to investigate.
Use the cross-reference review for match claims and the retained-sample plan for future comparisons. Agree the commercial supply arrangement only after the technical limitations are visible.