WO Release/Print causes Lock Table overflow

[mosfin]

i use menu 16.6 - WO Release/Print, and with certain Item
it fails and gives this error message:

Cannot execute user defined function 'getTermLabelRtColon' in an ASSIGN
statement after a key field change. (7954)
Cannot execute user defined function 'getTermLabel' in an ASSIGN statement after
Lock table overflow, increase -L on server (915)

with other items there's no problem, only one item causes this
do you have an idea, why this happens ?
thanks