Can we force or predefine an input mask for job numbers allocation which should be validated at input level?
No – At this stage, the job number allocation is a manual input. This can be done at any stage in the process however. i.e. you may use a quote number initially when you are quoting, and then, when you get the job, you can enter a job number to used for this job. On the reports that are generated however, you can display whatever text strings you wish.