Dear Rohan
without additional information: I assume that you tried to dispatch coversheet and SDS/MSDS via eMail (but there might be the chance that "print" might give the sane issues (some SDS/MSDS in europe can be quite big in size of pages because of REACh)
Can you please check how many SDS/MSDS are part of one "bundle" to be shipped to the same customer? At least the system is "forced" to bundle one cover sheet and one SDS/MSDS in one "bundle"; sometimes the size of these two filea (in most cases pdf 1+ rtf file) together exceeds the minimum as defined ( in your case 1000000). Therefore the system can not dispatch
C.B.