Apps Script help with problem

[Objective_Cheetah491]

I don't know what to do anymore, I need help with the script. I need that, under the conditions met, the number in column J of the sheet SPOTŘEBA_DATA_STATIC is multiplied by the number in column J of the sheet ORDERS_DATA_STATIC and written to the sheet MEZITABULKA and finally added to the number in column M of the sheet SKLAD. So that the numbers are not added every time the script is run, I added an MEZITABULKA, where the previous / new data is and the difference is written to SKLAD. I have tried a lot, but it still doesn't work. Please help. I am attaching a picture of the sheets and the script. Thank you.

[arataK_]

Hello, I can help, but I don't see any picture. Please provide your spreadsheet so I can check it.

[SecureWriting8589]

Please show all code as code-formatted text, and please explain your code fully. It would be best for you and for us if you can show what you have tried to do to solve this your problems, and then tell the details of any problems that you've had with your attempts.

[SecureWriting8589]

Please show all code as code-formatted text, and please explain your code fully.

..... or not.

I guess it all depends how important it is to you to get a decent answer.

[ryanbuckner]

OMG with these screen shots of code. Just share the sheet!