We ran this test case (see attachment) recently for which the masking job failed when using the masking option "FORMATENCRYPT1DELIMITER=SPACE -"
If you could reproduce the issue and let us know why it fails.
Although, if we remove this masking option the masking job succeeds.
Tried changing the order of the delimiters and it did not make a difference.
Release : 4.9.1
Component : Mainframe
We tested this on version 4.9.179 and version 4.9.196 of FDM
This patch (FDM 4.9.199) resolves it.