out of balance error

[adrian <ad...@sn...>]

I attampting to post some GL transaction I sometimes get the following
error:

Error!
Debit and credit out of balance!

I have attached the screen dumps.

More detail:
A GL transaction for petty cash, so Petty Cash credit $13.05
	Sundry exp $11.86
	GST $1.19
Update form
Post Transaction   .....

Error

The crazy thing is that sometimes it works.  I had one transaction that
I tried several times, several days later I tried again and  it worked.
I just tried re-logging in, but no success

Any thoughts as to why?

Adrian
-- 
Adrian Blake
Snowy Technology Pty Ltd
26b Bombala St
Cooma, NSW 2630
Ph 2-64-524338 mobile 0407 232 978