I am having troubles with this bit of code: index( ri!arrayOfCom

Hi mokhtarc,

Seems that the ri!arrayOfComponent is having a null value and that's why you unable to access its field. Can you try adding a null check like

if(
rule!APN_isBlank(ri!arrayOfComponent),
null,
index(
ri!arrayOfComponent,
wherecontains(
ri!arrayOfProduct[ri!index].id,
ri!arrayOfComponent.FK_productId
),
{}
)
          )

Great! It worked thanks

but still don't understand what it talks about types in the error...

@mokhtarc970 glad to know that it worked. Actually, such errors comes when you try to access any field of a CDT type variable that holds a null value. It is good to always have a null check on such variables before accessing their fields.

Be careful using APN_isBlank here if your array can get very large. The checks it performs can get very costly on larger sets.

As mentioned null handling is very important when accessing any fields of a CDT or any type variable.
But In few cases upon applicability and the requirement it is always better to use index function with default value present to access fields in CDT.

Ex: In the above code if you want to get the result even when ri!arrayOfComponent is empty then using index function with default value would be more helpful rather than completely skipping the code using null handling.

index(
ri!arrayOfComponent,
wherecontains(
ri!arrayOfProduct[ri!index].id,
index(ri!arrayOfComponent, "FK_productId", null)
),
{}
)