Return packaging process with BOM

Dear all,

We need to sell material A01 with return packaging A02. So that customer must send back packaging and only material A01 will be billed.

Please need your help.

• - I create material A01 ( material type HAWA), item category group (NORM)
• - I create material A02 (material type LEIH), item category group (LEIH)
• - I create material A03 (material type FERT), item category group (LUMF)
• - I create BOM, A03 at header level.

When creating sales order of material A03, system exploded BOM and ask price condition for material A01 and A02.

I need to enter only price condition for material A01 because A02 is returnable packaging.

Please help me to achieve this.

Best regards.