Greetings Sindhu,
Sorry, if I understood right: You updated the info structures, which is the second part of that procedure. However, beforehand, did you update the PMCO "Cost structure of maintenance order" table? This is a prerequisite, as before you do the infostructures update, you have to regenerate the cost structure data for "old" orders according to the "new" cost element grouping.
So have you ran the OLI5 transaction (RIPMCO00 report) ?
Have you checked the entries in PMCO for your "old" orders?
If you have, and still there are errors, there must be some further inconsistency in your cost element assignment to Value Categories, check in
SPRO > Plant Maintenance and Customer Service > Maintenance and Service Processing > Basic Settings > Settings for Display of Costs > Check Consistency of Value Category Assignment