Question
We recently planted veggies in raised beds but used mushroom soil entirely without mixing with other soil.  Is this o.k.?

Answer
Hi Shirley, You may end up with water issues.  If it doesn't dry quick enough, excessive moisture makes key nutrients like iron and calcium unavailable to the plant.  It may dry very quickly in the heat of the summer making it difficult to keep the plants from wilting.
It would have been better to blend the mushroom compost with your existing soil.  Jim