Set default value for a list using BPA

I’m trying to set a default value for the Supplier Invoice Consideration list on the Inventory Part Page using BPA.

The BPA is able to set the note to Ignore Invoice Price, but is not able to put that value in the Supplier Invoice consideration

When adding execution.setVariable('InvoiceConsideration', 'Ignore Invoice Price');

and the variable in the ExportValue Section I get the following error 

InventoryPart/Form (server error)
Error while serializing contents.

see file (serializingBPA)

the field is present in the REST CALL response : 

….

    "TechnicalCoordinatorId": null,
    "InvoiceConsideration@odata.type": "#IfsApp.InventoryPartHandling.InvoiceConsideration",
    "InvoiceConsideration": null,
    "MaxActualCostUpdate@odata.type": "#Decimal",
    "MaxActualCostUpdate": null,

….

see file (defaultPartResponse.txt)

Thnak’s in advance for your help