Sorry, I have found the solution.
Next time I will search a litlle longer before I disturb you with such a easy question.


1000 times sorry

This is what I found in the MSDN

'SYS(3) may return a non-unique name when issued successionally on a fast computer. Use SUBSTR(SYS(2015), 3, 10) to create unique, legal eight character file name.' msdn98