Create Material Master Data through SDK

Hello,

currently, I have difficulties in creating an instance of material BO as it dumps (Unexpected error during backend processing).

In the BeforeSaveEvent, I have implemented following absl-code:

import AP.FO.ProductDataMaintenance.Global;

import AP.Common.GDT;

//define root node

var elMaterialRoot: elementsof Material;

var newMaterial;

newMaterial = Material.Create(elMaterialRoot);

//if new instance was set, set relation from this BO to BO Material:

if ( newMaterial.IsSet() ) {

    this.ToMaterial = newMaterial;}

          else  { raise MaterialCreationFailed.Create("E");  }

newMaterial.InternalID.content = this.MID.content;

newMaterial.Description.GetFirst().Description.content = this.Description.content;

newMaterial.InventoryQuantityUnit.MeasureUnitCode = this.BaseUoM;

newMaterial.DemandPlanningCategory.ProductCategoryIDKey.ProductCategoryInternalID = this.ProductCategoryID;

In the documentation I am told that the Material BO is accessible through queries. Does that mean that I am not able to create material master data in the way I displayed?

Best regards and thanks,

Rufat