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Old 14th Apr 2011, 08:01
  #81 (permalink)  
Final 3 Greens
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From CAP413, chapter 2, page 6

I have received all your last transmission.
Note: Under no circumstances to be used in reply to a question
requiring a direct answer in the affirmative (AFFIRM) or
negative (NEGATIVE).
No mention of the last transmission being understood, only received in whole. (Although I agree with Flybymike's view.)

If you look at most of the examples in CAP413, 'Roger' is used to acknowledge receipt, before a further message is passed, with the further information or question then setting the context for the reply.

I would opine that 'Roger' alone can be ambiguous.