linking Operating unit to retail channel in AX 2012

Hi,

I am trying to use 'stores' as a financial dimension in AX 2012. However, I am unable to achieve the linking between 'retail channel' and 'operating unit'. Therefore, I tested this in Contosso also and get the same issue.

The following steps are followed:

Create a dedicated warehouse and mark this as store

create a retail channel and assign this warehouse as warehouse and shipping warehouse.

update other fields. However, we get an erro saying that  "Field Operating Unit number must be filled in.

also another STOP error "Cannot create a record in Operating Unit (OMOperatingUnit).Party ID 8866. The record already exists

any help appreciated

Thanks