serial number problem
We have a material with serial number.some materials is used some areas in the city before we started to use SAP.After SAP,we add these materials to the system,and appears as mounted anywhere.Then the producer company produce new materials by the same serial numbers with the last years.And then the new materials can be added into warehouse ( i have no idea how the system accept this operation ).now some materials appear mounted and stored at the same time.when I try to mount the material in the warehouse the system is not allowed this operation,cuz this material is already mounted in the area.I changed the serial number of the mounted material to be able to use the stored one, but when i changed mounted one also stored changed too.
basically, i have two material with same serial in reality but system have one material with two property.
My last plan is, I will move the material as a scrap from the warehouse and then again enter the warehouse with any movement.But this is not acceptable for accountancy if there is any other way..
Pls share with me if you have any other idea...