Broken Coverage Definition in VPLAN

Hi

I have a VPLAN, and I have a set of coverage data.  I have mapped my functional coverpoints from the coverage data to the VPLAN.

When I view the VPLAN (in eplanner) everything is mapped.  When I view the coverage data (using IMC) I see all my covergroups hit.

BUT when I look t the coverage results in the VPLAN view a number of sections (not all) are showing errors (no checks) and are reporting 'Broken Coverage Definition'

Can anyone tell me what I might have done wrong ?

Regards

Tim

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