To amaze you and challenge your statement, "I would be amazed if manufacturers would make such a direction". I provided three examples of Anti-D typing reagents that did give such direction.
For patient testing, ORTHO requires an interpretation of Rh Positive (assuming a negative control test) if a positive test result (presence of agglutination) is demonstrated with any of their Anti-D typing antisera (liquid or Gel).
For your further amazement and amusement, please read the following from CAP announcing 2018 revisions to the Transfusion Medicine Checklist, "Also clarified in the 2018 checklist is that the use of molecular-based screening assays alone for ABO and Rh(D) blood type assignment is unacceptable for transfusion or transplantation. “We still do not know completely everything about ABO and Rh molecular typing,” Dr. Gandhi says, which is why TRM.40550, “Forward/Reverse Typing,” now says an FDA-cleared or -approved serological method must be used. ABO/Rh typing for transplant or transfusion has to be done “by an FDA-approved method, and right now that’s only serology,” Dr. Gandhi says.
“We use molecular-based testing for a lot of blood bank phenotyping now,” Dr. Park says,
“but it is not acceptable and it’s just not the right testing and methodology for ABO and Rh.” ABO and Rh typing by molecular methods is complicated and not without risk, she says, adding, “Serology is very simple, so go with the simple one that works well.”