3502747 - Revenue Recognition Run Warning: Costs without assignment to a sales order exists for project

• The revenue recognition run finishes with the warning 'Costs without assignment to a sales order exists for project XYZ' (XYZ represents a customer project ID). 
• When checking the Edit Time and Expenses screen for the project, all expenses are assigned. 
• You verified that all costs, posted in previous and the current accounting period are assigned on or before the revenue recognition run's posting date. 
• Why does the warning still appear? 

SAP Business ByDesign

deferred unassigned cost, expense assignment reversal unclear, costs without assignment to a sales order exists , KBA , SRD-FIN-COR , Cost & Revenue , Problem