2522110 - Cannot create new Product Allocation configurations

You already configured some product allocations in the system, and now you want to add new one.
You created the product allocation procedure (t-code OV1Z) and the product allocation object (t-code OV2Z) without any problem.
However, when you add new product allocaiton hierarchy in t-code OV3Z, you get below error:

• The step counter is empty for the discrete check against prod. allocation (Message No. VQ236)

You change the step counter to empty / blank as per the long text, but you get another error:

• The info structure is already used for another method (Message No. VQ240)

• SAP ERP Sales and Distribution (SD)          
• SAP R/3
• SAP R/3 Enterprise
• SAP ERP Central Component
• SAP ERP
• SAP Enhancement package for SAP ERP
• SAP Enhancement package for SAP ERP, version for SAP HANA 

T190S-KOMTH, Kontingentierung, Kontingentierungsobjekt, Kontingentierungsschema , KBA , SD-BF-AC-PAL , Check against Product Allocations , Problem