SMDT test cases - not able to link from SM_CRM

hi experts

we are creating SMDT test case incidents from SM_CRM. the test packages are created from STWB_2.  if the test case failed , then we need to create the incidents relating the test case.

when we create incidents using the transaction type SMDT , we are not able to link the test case from " Related Test case " block .

we are getting the below error

the procedure followed

1. create the test plan by including the business process.

2. Created test packages and assigned it to the developer

3. developer made the test to " test failed "

Please help with solutions.

thanks

Sol man