Psalm Book Section Formatting

Not sure if this is a Paratext issue, PTXPrint issue or something I've done.
This is what is in Paratext:

So, each Psalm starts with \c

In this case, there is the book section text marked with the \ms marker and comes after the \c .

However, PTXPrint prduces this:
(The rectangle was not produced by PTXPrint).

so the order of the \c and the \ms have been reversed.
Is this meant to happen?

THAMI-PsalmsPTXprintArchive.zip

What is wanted is to have the book section appear before the Psalm number. It is possible to do this by editing the Paratext source file by placing the book section text at the end of the previous Psalm as Paratext seems to insist on a chapter beginning with \c and nothing preceding it. Normally a typesetter can't change the Paratext file, so this isn't really an option.

I have been able to do this in the changes.txt file:

at PSA 42:0 '\s1' > '\s1 x'
at PSA '\c 42' > ''
at PSA '\s1 x' > '\c 42\r\n\s1'

which produces:

Archive attached.

Thanks

Alastair

THAMI-PsalmsPTXprintArchive.zip

Start with the attached THAMI-PsalmsPTXprintArchive.zip and inspect the supplied changes.txt, comparing the Paratext source order with PTXPrint's output. Reproduce the Psalm 42 case and trace the handling of \c and \ms markers. Done means the book section appears before the Psalm number without requiring manual edits to the source or changes.txt.