Pradhan, Shammi,
I don't think that coming forward with this detail now by updating your schedule A will delay your PPR or whatever the next step is in your case. It'll just be one of the documents they'll have to review whenever your file is reviewed/revisited again. But when they do revisit your file next, and find that discrepancy (it may get picked up in one of the various checks they carry out), the VO will most likely have no choice but to ask you to submit an updated schedule A and this will certainly cause a delay.
having said that, may the odds be ever in your favor.