this is a normal criteria (using the last modified date of the invoice itself)
<searchRecord savedSearchScriptId="customsearch_custpayment_savedsearch" xsi:type="q1:TransactionSearchAdvanced" xmlns:q1="urn:sales_2018_1.transactions.webservices.netsuite.com">
<q1:criteria>
<q1:basic>
<lastModifiedDate operator="after" xmlns="urn:common_2018_1.platform.webservices.netsuite.com">
<searchValue xmlns="urn:core_2018_1.platform.webservices.netsuite.com">2020-04-28T162300Z</searchValue>
</lastModifiedDate>
</q1:basic>
</q1:criteria>
</searchRecord>