Adding new keys to existing custom table

Hi,

I have a custom table which is used by several programs. There are search helps, lock objects, etc created on this table.

Now I have a requirement to add 2 new primary keys to the table.

I would like to know if this will create inconsistency to the programs/search helps/lock objects which is already using this table.

For example if there is a statement in a program like

READ TABLE ZCUST into ls_cust WITH TABLE KEYS,

Thanks,

Deepak