Non-Enterprise
If you are using a non-Enterprise version of Retain, then in Retain Manager, under Setup | Extra Settings... you can turn on an overbooking test, setting the % to test for, and whether it tests at any time within the period of the booking or whether it takes into consideration the whole length of the booking.
When you try and overbook someone you will be warned. If you want to prevent the warning from being overridden, you need to add an extra line to the .ini file with the same name as your .rdb file which is in the data directory. Under '[Overallocation]' add 'Allow=0'. When a user overbooks someone they will not be able to make the booking.
Enterprise
If you are using Retain Enterprise, then you should make the [Overallocation] section in the file retaine.ini look like the below:
This means as follows:
| DoTest=1 [0 for don't test, 1 for test at any time within the booking, 2 for test and take into account the whole length of the booking]
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| Threshold=100 [the number represents the overbooking percentage at which a warning is received]
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| Allow=0 [0 for don't allow the warning to be overridden, 1 for allow it to be overridden]
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