Goods issue with reference to WBS BOM

Hello Experts,

My goal is perform goods issue for all the materials listed in a particular WBS BOM.

I created the WBS BOM using CS71 and assigned various materials to it.

Now I am in MIGO trying a goods Issue with R10 Other as reference. I tried both with movement type 221 and 291.

Both cases I entered the WBS element in Account assignment tab and plant in the where tab. This showed up in the line item.

I even tried entering the material number that I used in the header of WBS BOM.

But when I click on explode BOM, in order to populate all the material numbers under that WBS BOM, I get error

" The system could not copy the sub-items in this line".

Any expert knows the correct way to perform a goods issue with reference to a WBS BOM, please help me out!

Thanks!