Is there any restriction on the length of all Primary keys in a table

Hi all,
Is there any restriction on the length of all Primary keys in a data base table?
i have some 10 fields as primary key in a DB table and length exceeds 120 and getting a warning.
Please let me know will there be any problems in future with respect to the same?
With regards,
Sumanth

Well actually there are constraints like
Total of internal lengths of all primary key columns        1024 Bytes
Number of primary key columns per table                     512
For other information about SAP database please refer to http://sapdb.org/sap_db_features.htm
Thanks & Regards,
Vivek Gaur
Alwayz in high spirits

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