They both have a business purpose. Common practices I have seen include:
DIR on a BOM - Pro:
- software image files that are loaded into a microchip at the time of manufacturing. By using a DIR, the exact version of the image can be controlled. We aware this involves two changes, 1) to the file version 2) to the BOM to include new version.
- Literature that will be "in the box" when product is packaged. Some may rather handle this using a "material" for the literature.
- file to be loaded onto a CD - ie a CD image that is stored in a DIR.
- keep in mind the concept of a Document BOM in which there is a document folder structure and documents within that folder. This is a very powerful concept with some interesting applications.
DIR on a BOM - Con:
- DIR on a BOM do not support concept of 'Current version'. Therefore, as outlined above, 2 changes may be required to make the DIR on the BOM 'current'.
DIR assign to MM - Pro:
- most common object assignment - used to define the "design" of the material. Common with CAD integration and other design documents that define the material. Also with literature, etc
- Supports concept of 'current version' where most recent "released" version of document is reported against the MM as 'current'. Valuable when business must insure everyone is working with released documents only. (ie like in manufacturing)
DIR assign to MM - Con:
- Does not support DIR by plant. (not that I'm aware of)
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