All my raw material are purchased in weight, but stored by lenght.
For each raw material , the weight is different for the same lenght of 1 meter.
I found a solution by used a new category of units for each product.
Have you another solution with a factor ( weight / lenght ) for each product ?
Please stop asking numerous questions about all the same problem without providing the necessary information. Please refer to your original question and provide the information you were asked for in order to get a proper answer.