Mate API not working

Not sure what are you referring to but the issue is not with fix or unfix. The mates that I am trying to create with my API, gets created but they are also suppressed automatically right after creation. Cant seem to find any reason why.

Thanks for your reply. No it is not repeatable, it is happening to different mates every time. The code is too big to post here, but the code section I am using for mates are this :

for co-incident :

swAssy.ClearSelection2 (True)

boolstatus = swAssy.Extension.SelectByID2(PL_tongue_plank_storage(i), "PLANE", 0, 0, 0, True, 1, Nothing, swSelectOptionDefault)

boolstatus = swAssy.Extension.SelectByID2(PL_groove_plank_storage(i + 1), "PLANE", 0, 0, 0, True, 1, Nothing, swSelectOptionDefault)

Set matefeature = swAssy.AddMate5(swMateCOINCIDENT, swMateAlignANTI_ALIGNED, False, 0, 0, 0, 0, 0, 0, 0, 0, False, False, 0, mateError)

for distance :

swAssy.ClearSelection2 (True)

boolstatus = swAssy.Extension.SelectByID2(PL_middle_weldment, "PLANE", 0, 0, 0, True, 1, Nothing, swSelectOptionDefault)

boolstatus = swAssy.Extension.SelectByID2(PL_97_assy, "PLANE", 0, 0, 0, True, 1, Nothing, swSelectOptionDefault)

Set matefeature = swAssy.AddMate5(swMateType_e.swMateDISTANCE, swMateAlignANTI_ALIGNED, False, middle_to_BV_97, middle_to_BV_97, middle_to_BV_97, 0, 0, 0, 0, 0, False, False, 0, mateError)

every mate I am using are basically copy of these two with some variations like aligned/anti aligned, dimensions flipped etc

below screen shot shows the mates supressed

Thanks

Fariz