Delete value if not used in another list

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Posted on by CU22100725-0

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Hello,

I want to delete some value if I don't used them in other list, to put it simply, I have 2 list, one has a text column where I enter my data and the other list with a lookup column where I can use the data I enter previously.

For exemple, if I create a data named "Day" don't use it If I create a data item called "Day" and I don't use it, I must be able to delete it and if I do use it, I must not be able to delete it.

I hope to be clear in my explanation,

Thanks in advance!

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Building Power Apps

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BCBuizer 22,505 Super User 2025 Season 2 on at

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Hi @TomVictor ,

To do this in Power Apps, let's call the list with the values the ParentList and the list with the LookUps the ChildList.

Insert a gallery in Power Apps and set its' Items property to:

Filter( ParentList, Not(ParentColumnName in ChildList.ChildColumnName.Value) )

This will display all items in ParentList that don't have a match in ParentColumnName in ChildList.ChildColumnName (which is the LookUp column).

This formula will give you a delegation warning, but as long as you don't have more than 2000 items in ParentList, this is not an issue.

Finally you can choose to add a remove button inside the gallery to be able to delete individual items (OnSelect = Remove(ParentList, ThisItem) ) and/or add a button outside the gallery to remove all items (OnSelect = RemoveIf(ParentList, ID in GalleryName.AllItems.ID) ).

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CU22100725-0 129 on at

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Hi @BCBuizer ,

Thanks for your reply, I have a problem with your first formula, It tells me "Value is not recognised".

How can I fix it ?

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BCBuizer 22,505 Super User 2025 Season 2 on at

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Hi @TomVictor ,

Did you replace ParentList, ParentColumnName, ChildList and ChildColumn name with their actual names?

For clarification on what I'm referring to:

ParentList: The list with the Text type column in it

ParentColumnName: the Text type column

ChildList: The list with the LookUp type column in it

ChildColumnName: The LookUp column

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CU22100725-0 129 on at

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Hi @BCBuizer ,

I replace ParentList, ParentColumnName, ChildList and ChildColumn name with their actual name like this :
Filter( 'CRM - Paramètre Unité'; Not(Unité in 'CRM - Lignes commandes'.Unite.Value))

I don't see where is my mistake.

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BCBuizer 22,505 Super User 2025 Season 2 on at

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Hi @TomVictor ,

It seems that the in operator does not like working with complex types. Can you please try this:

Filter( 'CRM - Paramètre Unité'; Not('CRM - Paramètre Unité'. Unité in AddColumns('CRM - Lignes commandes'; "vUnite"; Unite.Value).vUnite) )

Basically it adds a column to the ChildList with the value of the LookUp column as plain text. This can then be used to filter the ParentList.

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CU22100725-0 129 on at

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Hi @BCBuizer,

I try and it still not working, "Impossible to convert this type of data", that's what my PowerApps said.

May be it's a problem with my ParentList ?

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BCBuizer 22,505 Super User 2025 Season 2 on at

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Hi @TomVictor ,

I think I was able to replicate the issue in my tests. Can you please try:

Filter( 'CRM - Paramètre Unité' As ParentList; Not(ParentList.Unité in AddColumns('CRM - Lignes commandes'; "vUnite"; Unite.Value).vUnite) )

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CU22100725-0 129 on at

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Hi @BCBuizer,

It works perfectly now, thanks for your help !

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