Dear Vara,
I assume you mean the studentnumber and not the object ID's?
In SAP SLM there is a standard switch which you can use to choose a numeric student number or alphanumberic. Beside that you have a Badi which gives you more flexibility:
Requirements
You need to implement the business add-in for assignment and checking of student numbers in the following cases:
You want to use numeric student numbers which must comply with special rules and have a check digit, for instance.
You want to use alphanumeric student numbers.
IMG: SLCM --> Master data in SLCM --> Student Numbers and Object ID's --> BAdI: Student Number Assignment
Because the student number is an attribute (abbrevation) of the object (1000) ST you will likely will not face problems in SAP SLM with an alphanumeric student number.
Rob
