When using nlapiSearchRecord() the results are limited to 1000 rows. It is however possible to get more records using nlobjSearch object which supports unlimited rows in the results.
nlobjSearch with its getResults() method can be used to fetch a specific range of records, which is limited to 1000 rows but can be used in a loop. Note: Execution of getResults() method consumes 10 governance units.An example script used to fetch more than 1000 Sales Order records:
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