Open Dataset in Append --> Error: No such file or directory

Good day Everyone

I am opening 3 files in append:

1 )/usr/sap/SAPBP/interface/XIU/batch/CUSTUPDT72_061011123801680.E3.SUCCESS

2) /usr/sap/SAPBP/interface/XIU/batch/CUSTUPDT72_061011123801680.SUCCESS

3) /usr/sap/SAPBP/interface/XIU/batch/CUSTUPDT72_061011123801680.E3.SUCCESS

OPEN DATASET IV_FILENAME FOR APPENDING IN TEXT MODE ENCODING DEFAULT MESSAGE LV_MSG.

When i do this, 1 one the files is created and the other 2 return message: No such file or directory.

Since 1 of the files is being created, the directory cannot be invalid.

Can anyone please provide me with sugestions on how i can get the other 2 open as well.

Sincerely,

Marc