Co-product planning

Hello all.

I am trying to plan orders for a co-product using master planning.

I have an item B (formula item), which has 1 dimension. I’ve created 2 formulas, depends on dimension. And as co-products I wrote down an item A (which also has 2 dimensions) in each formula.

E.x. Item B with color dim “Black” has a co-product A with Size dim “Large”

Item B with color dim “White” has a co-product A with Size dim “Small”

When i run master planning for co-product A with Size dim “Large” i got the following error:

"Item number: A .

Dimension No.: UMF-000001

Mandatory coverage dimension Color (dimension of formula item O.O) not specified

Cannot create a record in Planned order (ReqPO). The corresponding AOS validation failed."

I used planning item production type instead of formula. Didnt help(

Is it possible to plan co-products of formula item, which has 2 dimensions??. How can i solve that problem. Help. Thanks