Delete Segmentation Model in Hybris Marketing

Trying to delete a Segmentation Model in Hybris Marketing, but allways get the error message, that ther is a dependency to an existing target group. All targetgroups based on this segmentation models are completed.

On the documentation i just found these information regarting this issue:

Select one or more segmentation models and choose Delete Segmentation Models to delete the models.

Note that you can only delete a segmentation model when the according authorization is granted to you at the segmentation profile on which the model is based.

To grant the authorization to delete segmentation models maintain the authorization object GSEG_START.

http://help.sap.com/saphelp_mkt121/helpdata/en/63/2e2651c294256ee10000000a445394/content.htm?frameset=/en/38/4cec689d514199bff6b2837a5482c8/frameset.htm&current_toc=/en/b7/a51586b7114f599b0decbc3ca4e0cb/plain.htm&node_id=127

Thanks for your help!