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Answer:

The following text is taken from the Q&A page for the European Medicines Agency’s Quality Working Party:

From a pharmaceutical quality perspectivepoint of view, the approach taken in the harmonised general chapter Uniformity on uniformity of dosage units (2.9.40) is considered equivalent to the requirements in general chapters 2.9.5 and 2.9.6. It Thus, the decision on which approach to take is left to the user to decide which approach to take. Either 2.9.40, or 2.9.5 and 2.9.6 may be applied to demonstrate compliance with the Ph. Eur. with regard to the uniformity of dosage units.As stated in the respective dosage form monograph, where justified and authorised, the preparation complies with the test for uniformity of content or mass (2.9.6/2.9.5)

For more details, you can also consult the Questions & Answers provided by the Quality Working Party of the European Medicines Agency on their website.