could not add or delete reference in sketch

[ptc-1962449]

hi, guys

I encountered an issue when I was editing a sketch, the system give me a hint: you could not add or delete the reference,

thanks in advance

[ptc-810450]

Probably the feature described by the sketch is mirrored. You will need
to delete the mirror, make the change and remirror. Usually the mirror
command is not as useful as it seems.
--
Mark von Huben

[ptc-1962449]

thanks for your reply.
actually, i found a clue that I`m not sure, all the datums in the reference of this sketch are in a same pattern.






In Reply to Mark Von Huben:

Probably the feature described by the sketch is mirrored. You will need
to delete the mirror, make the change and remirror. Usually the mirror
command is not as useful as it seems.
--
Mark von Huben