For Verbs, The answer is no.
Section 7.6.3 pg 112 near top "If the length of the access is zero, the RI MUST NOT perform any of the above checks on the Memory Region."
Section 7.10.6.2 pg 124, 2/3 down "If the length of the access is zero, the RI MUST NOT perform any of the above checks on the Memory Window."
Additional point: checking IRD credits is a check on the connection(QP) not on the Memory Region/Memory Window.
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