3793876 - System Throws an Error While Performing Check Consistency in Bill of Materials

While performing Check Consistency in Bill of Material 123, the system displays error message:

"Variant 1 of BoM 123 not consistent
-----> You cannot assign more than one line item to line item group"

(123 represents Bill of Material document ID)

SAP Business ByDesign

Bill of Materials; Check Consistency; Variant not Consistent; Line Item Group; Cannot Assign more than One Line Item; Multiple Selections Allowed; Input Products; Inconsistency; Consistency Check Error; Production Master Data; Selection Constraint; ByDesign , KBA , AP-PMM-BOM , Production Bill of Material , Problem