China golden Tax IDGTCN_OBFILE_CI split after 8 position

hi Gurus,

question: our System in Splitting ths gts invoice after 8 positions .

i cant find the Settings/customizing where this happens....

customizing under xxx billing Country-specific- Features - maintain Maximum number of billing items

is set to 0 for the sales Organisation.

also the copy control billing document - has no entries for doing a split after 8 positions...

has someone a hint - where in the wold we can find the entry to split after 8 positons?

thank you very much....