Numbering sequentially about multiple Project Types has same prefix.

Summary:

Do you know can we number sequentially about multiple Project Types has same prefix?

Like the following screen shot, we would like to put the same prefix on different Project types.

What I want to is the following image.

[Initial Condition]

Project Type/Prefix/Number

• Project Type-A N 300001
• Project Type-B N 300001

[Step1.Create new Project about Project Type-A ]

• Project Type-A N 300001

[Step2.Create new Project about Project Type-B ]

• Project Type-B N 300002

But if I try to do Step2, it have error.

Can't we number sequentially about multiple Project Types has same prefix?

Please let me know.

Thanks,

Mayuko