Diagnosis
The following causes can appear:
The sales document has no account assignment object. However, anaccount assignment object must exist if you want to be able to performExecution Services.
The system cannot determine the account assignment category for thesales document.
The account assignment category is selected via the main strategy orthe requirements class. The requirements type determines therequirements class. In the standard system, requirements types arefound according to a specific search strategy beginning with thematerial strategy group.
For further information on the search strategy, see the Customizingdocumentation for Check Control ofRequirements Type Determination.

System Response
The system cancels your action.

Procedure
If the sales document has no account assignment object:
RESET N1
Change the sales document.
Enter an account assignment object. You should enter either a salesorder or a WBS element depending on your Customizing settings for theaccount assignment object.
Save the sales document.
If the SAP System cannot determine the account assignment category, youwill check the search strategy and enter one of the followingCustomizing settings:
RESET N1
Enter the strategy group in material master (MRP 3 view).
The following strategy groups are relevant for BOS in Sales andDistribution in the SAP System:
Make-to-order (20)
Make-to-order/project settlement (21)
Enter the MRP group in material master (MRP 1 view).
You will define the strategy group/MRP group combination in Customizingfor Controlling under Product Cost Controlling ->Cost Object Controlling -> Product Cost by Sales Order ->Control of Sales-Order-Related Production/ Product Cost by Sales Order-> Selection of Requirements Type Through MRP Group ->Check Strategy Group for MRP Group.
You will define requirements types and requirements classes inCustomizing for Sales and Distribution, under Basic Func
tions -> Availability Check and Transfer of Requirem
ents -> Transfer ofRequirements.
Enter the MRP type in material master (MRP 1 view).
You will define the item category/MRP type combinations in Customizingfor Controlling under Product Cost Controlling ->Cost Object Controlling -> Product Cost by Sales Order ->Control of Sales-Order-Related Production/ Product Cost by Sales Order-> Check Control of RequirementsType Determination.
You will define requirements types and requirements classes inCustomizing for Sales and Distribution, under Basic Func
tions -> Availability Check and Transfer of Requirem
ents -> Transfer of Requirements.