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NL-function: Show results for which other NL returns true

Hi All,

using Jet Reports and Excel 2003 with Nav 5, I am looking to get results by an NL function under the condition that another NL functions returns the right value for these results.

Case:
Show me certain customer IDs from the Item Ledger Entry within a certain date range IF it is the first occurance of an entry for that customer ever. This is how I tried it (translated from German), but it returns no value:

=NL("Rows";"Item Ledger Entry";"Source Nr.";"=NL(""First"";""Item Ledger Entry"";""Posting Date"";""+Posting Date"";""*"";""Source Nr."";NF(;""Source Nr.""))";"="&[field with date range]")

Thanks for your help!

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