HI Christoph -we found the problem today. For the new library name, when we go to the "details" of it, the internal number range was blank. I entered 0I and now it works!
Originally, I only went to the SPRO activity "Specify Number Ranges for Phrases" and saw entries there, when I should have gone to the phrase library, clicked Details, and then made sure the active library had a value for Internal No Range entered.
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