Grain Percentage Calculation

I'm not sure if this is a bug if if I'm just wrong.

When the grain Percentage is calculated. (Grain Pct when looking at your Recipes)
If you use all grain is looks fine but not when using Dry malt (Partial Mash or Mini Mash) it doesn't add up.

For example:
1000gram Malt = 600gram Dry Malt Extract.

Shouldn't the grain percentage when using DME be calculated by DME * 1,6666 (1,2/3) instead of the DME gram?
600 gram DME * 1,66666..... = 1000 gram of Malt.

Example:
600 gram Grain and 120 gram of Crystal 60L = 80% and 20%. (With grain this looks correct)
So for DME... Shouldn't it be converted to "Malt" before calculating the percentage?
600 gram DME and 120 gram of Crystal 60L = 88% and 12%. (120 / (600*1,66667))

I'm rather new to Homebrewing so I might be wrong.

Right now the grain percentage is done by pure weight which is the most common usage.  I've had requests to also do it by gravity point contribution but have not yet implemented that feature.

Brad