Unable to delete trial instance

Hello,

i tried to delete my trial instance but got the following error message:

Unable to delete trial instance 'opensap': Bad Request (400) - Error deleting DB user NEO_BFGARUYQJV3X3FK85L2PRF39Q on DB instance Sid='JN4' , Url='jdbc:sap://vadbjn4.nwtrial.od.sap.biz:30015/': Could not disable development package: {
  "error-arg": "",
  "error-code": "40132",
  "error-msg": "Repository: Package not found;package not found, package name=d037021trial.opensap.shineopensap.data"
}

Any idea how to resolve it?

Thanks and regards,

Steffen