Valid Character set for Data type CHAR

Hi all,

Where can I see a valid character set for the data type char.

Scenario:

The BIN (LGPLA) in WM (LAGP) is a CHAR 10 data type Users have requested that we set up the BIN ID as xx000xx.

or similar I am trying to discourage the . at the end but they want this as a unique Identifier and will be at the end of all bins,

My concern is that this may at some point cause a problem for ABAP coders.

Is this a valid concern?

I know SAP has special characters such as * and - but is . a special one or are my concerns unfounded?