An object of the Manual task type must have a connection with one of the following single organizational elements in an assigned function allocation diagram:
Organizational unit - XPDL tag: ORGANIZATIONAL_UNIT
Organizational unit type - XPDL tag: ORGANIZATIONAL_UNIT
Role - XPDL tag: HUMAN
Group - XPDL tag: ROLE
Position - XPDL tag: ROLE
Please make sure that the correct symbol is modeled. This is not absolutely necessary but generates a message during transformation.