Hi Caetano,
Thank you very much for this very quick answer. I could not look into the whole documentation you provided, nevertheless you gave me the answer in your post (quantities are always reduced to allocated quantity).
About the "Zero values to MRP", I did look into it,and I think it is rather MC7D t-code than MC7F.
MC7F
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MC7D
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If you could edit your post and let me a little bit of time to test this customizing, I would gladly tag your post as the correct answer.
I will keep you posted ASAP.
Regards,
Pierre