Hi Bernando,
Don't compare the job log of different archiving objects(Either WRI or DEL). It would not be common.
Deletion indicator has to be set on PO's before archiving. Please run the pre processing job beofe running the WRITE job. If the entries does not met the condition it would not create any archive file.
Also you have not given the screen shot of write job. Please check.
Regards,
Sudheer T