Error: Invalid percentage (must be between -1000 and 1000)

If your Transaction requires you to enter 100% contribution for 12 or more Sales Reps you will encounter this error message when trying to enter a -1100% contribution for your Adjustment Sales Rep:

Invalid percentage (must be between -1000 and 1000)

Here is a way to enter an Adjustment Contribution of more than -1000% in a single transaction for your Sales Reps:

1. Create a second Adjustment Sales Rep on Setup > Sales > Sales Preferences
2. Enter a new Sales Order
3. Fill out the necessary fields for the Sales Order
4. On the Sales Team Tab enter first the two Adjustment Sales Rep
5. Add the remaining 12 Sales Reps all with the Contribution of 100%
6. Set the Contribution to the two Adjustment Sales Reps to -1000% and -100%