Rule 1 in EasyEDA is that the Schematic is the master document so **all connectivity and footprint changes must be made in the schematic first** and **then those changes imported into the PCB**. You must not make changes to connectivity and footprints in the PCB directly because then the validity between the checks made using the Design Manager in the schematic and the Design Manager in the PCB will be broken and there will be the sort of chaos that you are seeing with your project when you try to update the PCB. The Schematic Design Manager may tell you everything is OK in the schematic and the PCB Design Manager may tell you everything is OK in the PCB but they do not actually talk to each other so the only way you know that the PCB matches the schematic from which it is supposed to be created is that when you do an **Import Changes...** or an **Update PCB...**, there are no differences. To apply net labels in the schematic use the netlabel, netflags or Newport symbols in th writing tools palette. Or press the N hotkey. I strongly suggest that you read (2) in: [https://easyeda.com/forum/topic/How-to-ask-for-help-and-get-an-answer-71b17a40d15442349eaecbfae083e46a](https://easyeda.com/forum/topic/How-to-ask-for-help-and-get-an-answer-71b17a40d15442349eaecbfae083e46a) and pay particular attention to the Design Flow diagram in the main Tutorial.

Thanks for your quick answer, For this example, the problem is that when i convert to or update my PCB i do not have +V net but U1.1-8 net for all Ux.1-8 Pad, same thing for -V i have U1.1-4 net for Ux.1-4 Pad. and i have to change the name U1.1-8 net by +V net and U1.1-4 net by -V. I would like to have +V net and -V net for all of them All the U are Opamp connected to +V and -V Thanks

Please study this topic: [https://easyeda.com/forum/topic/EasyEda-Schematic-Check-Nets-Fail-f8235432031d4d1dac36e790b1a38a70](https://easyeda.com/forum/topic/EasyEda-Schematic-Check-Nets-Fail-f8235432031d4d1dac36e790b1a38a70)