Process Chain: Dump when loading on PSA, but status on yellow

Hi experts,

I have this weird problem when executing my process chain: when data is being loaded to PSA through the Infopackage, the status is yellow forever... when i realize there must be something wrong i find a syntax error (through ST22).

The curious thing is that, if i reactivate the infosource from RSA1, and launch the process chain again, it will work ok for this very psa, but it will have this same problem on a different psa.

This is happening randomly, and it is driving me quite crazy, for the process chain is behaving in a different way each time i execute it .

Thanks in advance

Diego