You are currently just putting buzz words into your discussion
As you added now LT31 for label printing I moved this discussion to Logistics Execution space as these are WM transactions.
But in your subject you had said "error in SP01" and you did not at all tell which error you see in SP01 - this should at least be possible even for a beginner with SAP.
And if your observation about a specific material is correct then the first thing to do would be to compare a material master of an item which works with the material master of an item that does not work.