Triggering by new item, multiple content types with different columns

[Mart1]

Hi,

I have a flow which triggers on 'new item in a sharepoint list'. There are 5 content types (CT's) in the list.

• CT1-CT5 have col_X (optional string)
• CT1-CT4 have col_Y (mandatory string)
• CT-5 is missing col_Y (by design)

I have added an 'update item' action setting col_X for all content types. However, when processing CT-5 I get an error that col_Y is missing from the triggering item.

It seems that the 'update item' action is adding some expectations to the trigger. I don't need col_Y to be present when processing CT-5.

I've tried to imply col_Y optional-ness by assigning concat(col_Y, '') but it isn't working in this case.

Question: do I need to move the 'update item' action to a separate, callable flow, to fully decouple it from the 'new item' trigger?

Apologies if this isn't fully explained - the browser timed out and I lost a more detailed explanation; I had to type it all again from memory!