The feature allows the user to utilize the Manual Check Number range from A/P Global Setup when entering a prepaid voucher using the Single Screen during A/P Transaction Processing. See the following Knowledge Base article for more information on the Single Entry screen:

To use this feature, set option 16 in A/P Global Control - Allow F1 Key to Seq Assign AP Check Number to Y. This will allow the use of manual check numbers in A/P Transaction Processing when entering a prepaid voucher.

Set option 17 in A/P Global Control - Next Sequential AP Check Number to a number greater than 500000. This  will represent a check range that is outside of the normal computer check range.  

Once this feature is enabled, the user will have the ability to press the F1 key from field 17, the Check Number field, to assign the next manual check number.