Dear Community,
Hope you can help me with this requirement;
1- In fact, we have a list of products and we want to replace it for example:
We have : A replaced by B then B replaced by C and C replaced by D what makes a chain of substitution A-B-C-D. What I want to display on each line is the first product of the chain in our case "A"

N.B :
- New Product : enterable by User
- First Product of the chain : calculated by formula and displayed
- Warning : calculated by formula and displayed
2- I want to display error message on this specific case (we cannot replace the same product twice, for example we cannot have A replaced by B and G replaced by A.).

Thank you for your help