[FLOW3-general] Mysql Error 1025 - errno 152

[David Sporer]

Hey guys,

I had a relationship between two model which I've removed.
It worked on my local machine but if I want update the database schema on
the live server I'm getting this error:
Uncaught Exception
  SQLSTATE[HY000]: General error: 1025 Error on rename of

'./usr_p171596_3/sporerwebservices_passbookpasses_domain_model_passinstance'
  to './usr_p171596_3/#sql2-316d-1638e4' (errno: 152)

It seems that dropping the foreign key fails.
Do you know how to solve this error? Should I drop the key manually?

Best regards
David