What is a recursive BOM?

Problem: What exactly does this statement mean “BOM is recursive” ?

Solution: 
This means that your BOM is incorrect. When it is “recursive”, it means that a lower level component in your BOM is calling out a material that is also HIGHER in the BOM. This is something that cannot occur in the real world and is a problem. As an example, say the BOM is simply supposed to be A calling out B. (A is made from B). Let’s say that you set up a one level BOM with A calling out B. Then you erroneously also tried to create a BOM with B calling out A. This creates a loop in the BOM and is also physically impossible. It says that A is made from part B, and then in turn B is made from A… Bottom line is that your BOM you are trying to create is not correct.

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