How do i retract contracted product

I belong to a CM, after i offered a quantity through a corp, it shows the exact number of product contracted and besides it, it shows the word retract. When i try to retract the already contracted product it doesn't work. I keep clicking and clicking and its not working.

So my question is how do i cancel an already offered material that is still in the corp stock.

Pls note: if i'm not in the CM everything works fine. Thanks

Maybe the contracted products are needed to fullfill the Minimum offered Products on the CM? Meaning if you would retract it then the Minimum isnt fullfilled

Ok..... That's true , you are right. I just noticed i could increase the figure but can't reduce it