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Deleting diff pairs in constraint manager

I have a pcb design where the pins in the previous version of this design were actually diff pairs. In the latest revision of this design, these pins have been changed to single type nets, not diff pairs anymore.

In the constraint manager I tried to delete the diff pair group but the delete button is greyed out. I tried unfixing the nets and symbols which are attached to these nets but still cannot delete them.

The nets are not considered diff pairs in the schematic.

I am using Allegro pcb editor 17.4

Thanks

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0 jaredryan12 over 3 years ago

Allegro PCB Editor was where the diff pairs were first defined in their entirety.

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0 Schulz Jordan over 3 years ago in reply to jaredryan12

Few cases if the design is assigned with IBIS models, the diff pairs cannot be deleted. Remove IBIS models & then delete the diff pairs. Sounds strange but it works
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0 Schulz Jordan over 3 years ago in reply to jaredryan12

Few cases if the design is assigned with IBIS models, the diff pairs cannot be deleted. Remove IBIS models & then delete the diff pairs. Sounds strange but it works
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