Dear Mick
Small add on: If remember correct you can enter a value like "-100.0000"
The "DEC 10(4) " definition allows only 4 places after the ", or .".
The "DEC" definition runs like:
DEC: Counter or amount field with decimal point, sign, and commas separating thousands. A DEC field has a maximum length of 31 places.
The "length" of the vlua ie max 10 characters. This includes: sign, comma, point etc. as explained
So you can not enter: 99.99999. This is not possible.
C.B: