With a post having parent and child categories = dupicate descriptions

Hi

Not if you can help or its the wrong section.

I have posts under a child category within a parent category (only on category ticked) and I am getting warnings of dupicate meta descriptions in my Google webmaster tool.

What ways are there around this ?

Do I remove all my child categories and just have one main parent cats covering all the posts under that large subject. Or do you just forget about the dupicate descriptions.

I am using Wordpress SEO, if that makes any difference.

Any tips would be mosts appreciated.

Thanks