Hi Srini,
You just need to be assure to have backup of your tables before upgrade, so this seems to be ok.
Otherwise mostly the appropriateness would be taken care by Su25 steps itself.
In reference to original error, it seems standard report not downloading TSTCA entry while download, but it is checking it while uploading, so seems SAP error, please raise it to SAP, to get more clarity on it.
BR,
Mangesh