Specifies the offset within the frame (in bytes) from the layer
according to rlPolicyGroupType. The limitation of this field is
according to the rlPolicyFlowClassificationOffsetGroupMaximumOffset
parameter if this OMPC is used by an entry in the
rlPolicyClassifierTable whose rlPolicyClassifierType is a protocol
for which predefined offsets in rlPolicyFlowClassificationOffsetsTable
are required.
rlPolicyRequiredOffsetGroups indicates for which protocols there is
such a requirement.