For issuance of Bills or Supporting claims, numbering unique index for each process is available. Specifically, to embed 'Process Model ID' that you can see in process model detail into 'Initial value' of String type data. Because 'Process Model ID number' supports output in complicated format such as resetting every month, you can use it as 'Managing ID' in various business scenes.
To Setup to Process Sequential Number Is Automatically Entered

When you create a business process, "automatic sequential number" will be available within the business. Set the following variables as initial value of business data to make numbering. Put them into the [Initial] field of [Process Data Item] menu in the Process Modeler.
Automatic ID numbering (Process sequence number)is available only on' String type data item' and 'Subject'.
- #{processInstanceSequenceNumber}
e.g:1, 11, 234, 7777 - #{#sformat('%04d', processInstanceSequenceNumber)}
e.g.:0001, 0011, 0234, 7777
Each time corresponding process is started, a sequential number is given automatically.
To Set The Process Sequential Number to be Reset Monthly

To confirm numbers to be given or to reset the sequential number, open the [Process model Detail] screen. You can choose from 'Daily','Monthly' or 'Annual' to reset the value.
Monthly issued 'Quote number' for example, chose reset type as 'Monthly', describe the following format which includes Year and month, the sequential number will be contain year, month and number.
- #{#format(processInstanceStartDatetime, 'yyyyMM')}-#{#sformat('%03d', processInstanceSequenceNumber)}
e.g.:201112-001, 201201-999