Naming Conventions for Document Types in SAP DMS

Hi,

I want to know what kind of naming conventions can be used for SAP DMS Doc Types.Generally for anything which is customized we used "Z".

But here we have already used Z for one plant and needs to implement to other plants, as DMS is not plant specific best possible way to use it is different Doc Types.

So now as "Z" has already been used so can "Y" be used or some other letter can be used.

As well as in future we have to extend it to other plants as well so how best we can do it.

Regards

Amulya