Values dissapear from Sharepointlist after editing row

[Eh2345]

Hello,

I have looked on a number of similiar threads but unfortunately haven't been able to find or figure out a solution. I have made an example to illustrate the problem:

Referencelist Ref contains single-text column Company and multi-line text column Prices. Prices is a string but the different entries are separated manually by ";" right now (there is no standardization for what values are put here). In the actual form I'm working on there are several other columns that make each row unique, if you're wondering why the list isn't distinct rows only. 

Sharepointlist Main contains single-text column Company and dropdown column Prices (with multiple values allowed enabled)

So Main is updated by values from Ref. In the form when creating a new row the user gets to choose one distinct value from Company and depending on this value, Prices is also determined. Prices is split by ";" (in order to let the user filter rows where certain Price-entries exist).

Creating a new row from the form works great, however when I edit the row the values of the ComboBoxes for Company and Prices are blank. If I reselect the correct value for Company the edit saves correctly, but If I edit the row and save without making a choice then Company is still correct but Prices defaults back to a blank value:

              

Below is a schema over the custom form and the values I figured were important:

Very frustrating, if anyone has any tips on what to try please let me know! 

[Eh2345 · Accepted solution]

I figured it out today after some more trial and error! I didn't realise earlier that I can collect the previously saved values of my edited sharepoint list row through SharePointIntegration. So, all I had to do was enter the following into the DefaultSelectedItems for ComboBox1: 

Distinct(Filter(Main;ID = SharePointIntegration.Selected.ID);Company)

Now all other dropdowns and ComboBoxes that depend on the selected value of ComboBox1 are populated correctly,so if I edit some other value they won't be reset to blank. Added bonus is that the user will see all previously saved values for the entry fields on row edit.