PREP_PROCESS file attends to read a file, to which the user has access rights set via posix ACL, for example with 'setfacl -m u:user:rwx /<filename>'
Following error is returned in the logs:
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U00029003 Cannot open file '<filename>(ReadFileAuthority())', error code '0', error description: 'Success'.
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Release : 12.3 Component : AUTOMATION ENGINE
This is by design. ACL is not considered by PREP_PROCESS_FILE, only standard system rights are considered.
The documentation has been updated accordingly.
https://docs.automic.com/documentation/webhelp/english/AA/12.3/DOCU/12.3/Automic%20Automation%20Guides/help.htm#Script/Reference/PREP_PROCESS_FILE.htm?Highlight=(UNIX)%20Permissions%20that%20are%20set%20by%20using%20ACL%20commands%20are%20not%20considered
Extraced from the link above:
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Important!
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Any changes requested to this topic, must be submitted to the community as Product Enhancement.