Prevent one forecast designator overwriting another in Targeted mode using FBDI in the same org

Summary:

How can we prevent one forecast designator overwriting another in Targeted mode using FBDI in the same org

Content (required):

We are uploading forecast using FBDI from external systems in different forecast designators in the same org . One forecast designator is for repair as an example and another for spares . The frequency of the load of the two is different and come from different external applications therefore cannot be loaded together . When repair forecast with designator REPAIR is loaded in org1 followed by spares forecast with designator SPARES in the same org1 in targeted mode, the REPAIR forecast is completely erased as per design. But we were wondering if there is any workaround to this other