Not able to fill a line item picker field via API

Hello,

We are using Unifier 20.12.5, we are trying to create a record and fill a field which is a line item picker via API.

We are facing some difficulties to fill this field.

Here is the error message we get :

Field name utxt_LineItem_AnaQualit is required.

Required field:utxt_LineItem_AnaQualit is not present.

Associated Detailed Qualitative Analysis: Input required

We are doing an Inser via API, create BP record V2.

It seems that it is not recognizing the line item picker.

Have you already faced this type of issue, or do you know any workaround ?

Also this field , BP Line Item Picker is a mandatory field in our Business Process.