Clinical and non-clinical document is provided only once
Any changes to drug substance, or safety related changes that affect the product, will require only one sequence
common documents can be included only once
all life-cycle is in one place
Documents that are common are presented only once and therefore read only once by the assessor
Any change to any strength/dosage from will add another sequence to the application (higher amount of sequences)
applicant wishes to withdraw one strength
Variations may be only applicable for one specific strength
could get complex
adding a new strength (line extension) could involve replacing all "common" document