Problem with drop down list

[BrunoDu45]

Hello community
I am embarking on the creation of Power apps and I already have a 1st problem.
I linked my form to an Excel workbook and a table named "TabSuiviDemandes"
I have one of the fields which must be filled with the selection of a drop-down list

DataSourceInfo([@TypeDélai]; DataSourceInfo.AllowedValues; "Type") 

This same list is linked to another table in the same workbook. Seems basic to me.
On the other hand, when I launch my app, it is impossible for me to use this drop-down list and I do not understand why
Do you have an idea with the little element that I can give you ?

Thanks

[RandyHayes]

@BrunoDu45 

You are stating that your datasources are all Excel. 

You mentioned your datasource table being TabSuiviDemandes, so what is TypeDélai?

At any rate, Excel does not have allowed values properties as it is considered just a table.

So, what are you trying to get values for?

[BrunoDu45]

Hi Randy,

"TypeDelay" is another table in my workbook in another sheet named "Params"

What I want to do is be able to select one of the 3 values ​​from my "TypeDelay" table to be able to integrate it into my monitoring table.

Like data validation in Excel 😉

I'm a noob 😂

[RandyHayes]

@BrunoDu45 

No problem on the noob part!

So, your Dropdown list Items property should just be the name of that table then - TypeDelay.  As long as you have this as a datasource, you will get it in your dropdown.