If you make a new file in Vsig, save it, then open it in a text editor, it looks like this:
If you open factory algorithms in a text editor and look after the TAIL| you'll usually see the initials of the person who made the algorithm.
That second lowercase tail| is superfluous, but that first uppercase TAIL| needs something after it, or else the algorithm will turn into a TRHU alg after being uploaded to the H9000.
So in Vsig 3.3, if you want to upload an algorithm that you started creating by clicking File > New File, you'll have to open the sigfile in a text editor and type anything after TAIL|
TAIL|patchen would work fine. Sorry about that.