manually adding transactions on electrum

[tarball]

Did you create the watch-only wallet using your master public key (xpub) or using specific addresses?

Thanks a lot, it worked!

[Abdussamad]

Single address. Perhaps thats the reason.

Yes it is:

https://github.com/spesmilo/electrum/issues/2897#issuecomment-330535625

edit: glad it works for you now