+-----------+-----------+------------------+-----------------------+
 | invoiceId | CompanyId |   InvoiceDate    | Closest Earlier Date  |
 +-----------+-----------+------------------+-----------------------+
 |    103111 |    219660 | 2018-04-30 00:00 | null                  |
 |    555056 |    219662 | 2019-02-12 00:00 | null                  |
 |    347454 |    219668 | 2018-09-28 00:00 | 2018-08-31 00:00      |
 |    402587 |    219668 | 2018-10-31 00:00 | 2018-09-28 00:00      |
 |    311889 |    219668 | 2018-08-31 00:00 | 2018-06-20 00:00      |
 |    179054 |    219668 | 2018-06-20 00:00 | 2018-06-12 00:00      |
 |    169563 |    219668 | 2018-06-12 00:00 | null                  |
 |    167041 |    319670 | 2018-06-08 00:00 | 2018-06-01 00:00      |
 |    572585 |    319670 | 2019-02-21 00:00 | 2018-06-01 00:00      |
 |    144796 |    319670 | 2018-06-01 00:00 | null                  |
 |    103274 |    319671 | 2018-04-30 00:00 | null                  |
 |    210641 |    319671 | 2018-07-06 00:00 | 2018-04-30 00:00      |
 +-----------+-----------+------------------+-----------------------+

ClosestEarlierInvoiceDate =
CALCULATE(
    MIN('Invoices'[InvoiceDate]);

    FILTER('Invoices';EARLIEST('CW-Invoices'[InvoiceDate]))
)