Order Number problem in Filemaker Pro 12

I have a serial number field i want to use to create an order number. However, even if i exit the record without saving, the number increments. How can I stop this happening and get the Order Number to increment only when I have saved the record? P.S. I am totally new to this, help wpould be much appreciated.
howardlAsked:
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Will LovingConnect With a Mentor PresidentCommented:
The Auto-Enter Serial Number function applies the Serial Number and increments the hidden "Next Serial Value" when you create the record. If you don't save the record, the "Next…" value is still incremented and used the next time you start a record. It doesn't reset backwards because the Serial Number has already been used.

If you want to reset the "Next Serial Value…" value anytime you cancel a record, then you would need to add a "Set Next Serial Value" script step to the Cancel script. The calculation needs to be able to determine the Maximum Serial value currently used and set the serial value to the next one. You can't just set it back to the previous value because another user might have already gone ahead and created a new record, using the "Next" value and incrementing it again.

In other words, while you can try to avoid skipped serial numbers, unless you are and always will be the only user of the file - meaning it's not hosted or setup as a multi-user database you'll only be able to set the serial number to the maximum serial number used. There are ways to avoid skipped order numbers but they are fairly complicated and likely not worth the effort to learn how to do it.

There are a couple of ways to determine the Maximum current serial number and set the appropriate "Next.." value. The main one would be to create a Self-Join relationship between the table and itself using the "cartesian" or "X" relationship option. This relates all records to all other records. I've called the relationship "Orders_SJ" Then you use the Max() function to determine the max value and add one:

Max( Orders_SJ::OrderNumber )
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howardlAuthor Commented:
Thank you for you quick response. Unfortunately I have not been able to make this work due to my newbie status. I am accepting your soultion but could you just point me in the right direction to achieve this, e.g. where to place the script?

Thank you Will
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Will LovingPresidentCommented:
Well, the first question is: Do you have a script that cancels the new record? Perhaps a button that either runs a script step or an actual script? Scripts are listed under the Scripts menu. You can determine what is connected to a button by going into Layout Mode and double clicking on it.

As far as making the Self-Join relationship, you go to File -> Manage -> Database. In the relationship diagram you'll see one or more tables. You need to duplicate the existing table, I'm guessing it's called Orders, and name it something like Order_SJ. Then create a relationship between the two Table Occurrences (aka "TO") from the Order Number field in one to the Order Number field in the other. Be sure to select the "X" option rather than "=" in the Edit Relationship dialog. That gives you the relationships you need. Once you have that you can base calculations on it such as the Max() formula I gave you above.
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howardlAuthor Commented:
Thank you so much Will.
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howardlAuthor Commented:
Really appreciate this
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