How can I add a restriction when I call to a report in Dexterity ?

Hi, when I call this script:

run report myreport;

for print a report, works fine but the report show all documents, I would like to show only lines that match a condition like this:

'POP Receipt Number' of myreport = 'POP Receipt Number' of window POP_Receivings_Entry of form POP_Receivings_Entry;

is possible ? thanks!!