LiveCycle Output: Font cannot be found (PDF/A) but is installed

Heya!

I'm using LiveCycle ES3 OutputModule calling the GenerateOutput2 method via SOAP to merge an XDP with XML data to an PDF/A document.

Unfortunately I get the output:

"(com.adobe.document.xmlform.ReturnStatus@33c0ab2b) XMLForm, render : 20511, Requested font 'Liberation Sans' was not found and font substitution is not allowed for PDF/A."

The "missing" font is located at/usr/share/fonts/truetype/ttf-liberation/.

I have a headless Linux server, so I configure everything using

/.../adobe_livecycle_es3/configurationManager/bin/ConfigurationManager.sh

In my cli_property.txt file, I've set the following settings:

AdobeFontsDir=/opt/adobe/adobe_livecycle_es3/fonts/

customerFontsDir=

systemFontsDir=/usr/share/fonts/

The properties were deployed via

./ConfigurationManagerCLI.sh configureLiveCycle -f cli_propertyFile.txt

I'm stuck here and looking forward to any help.

Thanks in advanced.

Phil