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Set Lookup Field in Sharepoint to Blank

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Posted on by wuffwuff2004

Hello,

I have a Lookupfield in a sharepoint list. In powerapps, I have a dropdown, now I set the dropdown to value and save the Form. All ok, but now I want to have a button, when I click this button i will that in my sharepoint lookupcolumn this entry will be deleted, same as I go to sharepoint and delete this item manually . So I used this code :

Patch(Liste_Personal; LookUp(Liste_Personal; ID = Value(DataCardValue518.Text)); {fk_per_pc_emprunte: Blank()});;

No error on the code, but m in my Sharepoint list , what do I do wrong? Thanks

Screenshot 2024-05-03 164801.png

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Rajkumar_M 3,743 Super User 2025 Season 2 on at

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Hi @wuffwuff2004

The Blank() function is used to represent a blank value for text fields, but for a Lookup field, you need to set it to null by using a record with a Value field set to null.

Patch(
Liste_Personal,
LookUp(Liste_Personal, ID = Value(DataCardValue518.Text)),
{fk_per_pc_emprunte: {Value: Blank()}}
);

Thanks!

If my response has been helpful in resolving your issue, I kindly request that you consider clicking "Accept as solution" and "giving it a thumbs up" as a token of appreciation.

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wuffwuff2004 33 on at

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Hello, I tried exactly this but this gives me the following error (I try to translate correctely):
"Wrong argument. It is needed an other record type with an other schema. In your formula is missing a column Id from type NUMBER"
Many thanks

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Rajkumar_M 3,743 Super User 2025 Season 2 on at

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Try this formula,

Patch(
Liste_Personal,
LookUp(Liste_Personal, ID = Value(DataCardValue518.Text)),
{
ID: Value(DataCardValue518.Text), // Ensure this matches the column name and type in your data source
fk_per_pc_emprunte: {Value: Blank()}
}
)

(Or)

Patch(
Liste_Personal,
LookUp(Liste_Personal, ID = Value(DataCardValue518.Text)),
{
ID: Value(DataCardValue518.Text),
fk_per_pc_emprunte: Blank()
}
);

Thanks!

If my response has been helpful in resolving your issue, I kindly request that you consider clicking "Accept as solution" and "giving it a thumbs up" as a token of appreciation.

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wuffwuff2004 33 on at

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Hi, Many thanks, the first one gives me the same error, the second one doesn't give me an error instead it won't remove the entry in my Sharepoint List.
Best regards

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