SAP GEF - Error in upload shapefile

[PAstolfi86]

HI,

on SAP GEF the shapefile loading functionality has been enabled in the "Editor" app and the newly loaded shapefile is displayed correctly but when saving the following error message appears

{
"Mistake": {
"code": "'400'",
"message": "Bad Request",
"details": [
"The geometry object key is invalid"
]
}
}

Debugging the PREPARE_EDIT_GEOMETRIES method of the CL_GEF_BL class I saw that the GEF_OBJKEY field for the various rows of the internal table LT_FEATURE_ADD is empty.

Why is the OBJKEY taken from the features coming from the shapefile?
Also I tried adding GEF_OBJKEY and EAMS_OBJNR attributes in the shapefile but they still aren't read.

Does anyone know if any further customizing configuration is required or does the shapefile have to follow a certain standard?

Thank you.