Sources used for ADR

 When defining ADR rules, I find it hard to determine what each source such as "reason" is.  I was hoping that "reason" was related to actual cost adjustment reason codes but instead it was material transaction reason code.  If I knew what each of the sources were I could be more efficient/creative without relying on custom SLA rules.

If I had information something like:

Source: reasons

tansaction name: material transaction

setup/transaction table: mtl_material_transactions

setup.transaction field: reason_id

setup table: mtl_?

If I had this information, I would not need to go through these things by trial and error.  For example, what is the difference between "reason" and "transaction reason".