In ChemDraw16 when draw structure with dative bond e.g. Pyridinyl N -> Ir and save as V3000 MOL file, examining the text of the file shows the bond has type 1 not 9 (dative/coordinate).
Loading the v3000 mol file into ChemDraw gives a structure with charge separation N+ Ir-.
Drawing the same structure in Marvin Sketch and saving as a v3000 mol file gives the correct file content and it can be re-imported into Marvin Sketch correctly. Loading this file into ChemDraw does not give the right structure - now the bond is shown as a standard single bond and the N is flagged as bad valence.
Is this a known problem? Is there a solution?