I'm having a problem with a little bit of Code that is:

Code:
merge 1:1 week using `A1', nogen
tempfile A1
save `A1'
The result I'm getting in Stata is:

Code:
. merge 1:1 week using `A1', nogen //625
invalid file specification
r(198);
I'm a bit clueless why this is happening. tempfiles are used and saved before in this do-File. Is there any way to inspect A1 at this point in the do-file? More importantly: Is there any obvious error in this code, as i tried finding something and just couldn't get to it?