Steps to reproduce:
1. Create a center under Head Office and activate it on 01 Jan 2013.Attach staff. Don't attach meeting.
2. Create a group under this center and activate it on 01 Jan 2013.
3. Create a client in this group with activation date 01 Jan 2013
4. Approve and Disburse JLG Loan(Frequeny weekly repayment) 02 Jan 2015.
5. Go to collection sheet. and select:
Branch Office: Head Office
Meeting Calender: 09 Jan 2015
Staff: *provide same staff name of the center
6. Click on "Productive Collection Sheet".
In Productive Collection Sheet page, there is no error message is displayed related to meeting not attached.
Expected Result: the error message should be displayed as "Collection can not be generated without meeting attached to center"