Can IBKR change the cost basis for non-covered stocks on my 8949 to match Form K-1?

UPDATE COST BASIS FOR TRANSFERRED SECURITIES

When securities are transferred to your account, cost basis information (acquisition date and price) may not arrive immediately. Until this information is received:…

IBKR is required to provide the IRS with cost basis detail on covered securities transactions for U.S. persons via the year-end Form 1099.  U.S. persons, therefore, may not change the cost basis on a transaction executed by IBKR and may only change the cost basis on positions transacted elsewhere and transferred to IBKR under the following circumstances:…

IBKR is not connected to the German Taxbox system to transfer cost basis relevant data on security transfers.

To update cost basis for your transferred securities to your account from your German Financial Institution please click here: How do I update cost basis information for transferred securities via basic FOP method?…

It is not possible to update cost basis information on IBKR Mobile at this time.

Additional Information…