Micros Systems Restaurant Enterprise 3700 POS Reports Manual page 246

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You may wish to use the Service Charge total to track autogratuities.
In this case, program any autogratuities you wish to track to add to the
service charge, and program all other service charges to add to gross
receipts.
Post to svc charges total works in conjunction with Charge tip on the
same form. Only one of these options should be selected. If both
options are selected, Post to svc charges total will be ignored.