Right-Clicking on an assembly and select Open Related Drawing in Managed NX raises the warning No Related Drawings found.
SolutionOpen Related Drawing was introduced in NX 1899, so that would be the minimum version the data would need to be last saved in for this function to work.
Noteshttps://docs.sw.siemens.com/en-US/doc/209349590/PL20190701150722612.whatsnew/xid1755521?audience=external&pk_vid=64db7959bbd96dc8eb3993574c2edde817162339437f471d