I was able to do this by copying tax code O1 to Y1 in transaction FTPX and assigning G/L 216200 to it.
I also needed a user exit to assign Y1 to the sales order and billing document:
User Exit SAPLV61A / RV61AFZB FORM USEREXIT_XKOMV_FUELLEN
*Assign tax code Y1 to Free Deliveries to accrue use taxes in G/L 216200
If KOMK-AUART = 'KL' and XKOMV-KSCHL = 'UTXJ' or KOMK-FKART = 'ZFD' and XKOMV-KSCHL = ' UTXJ' then
XKOMV-MWSK1 = 'Y1'.
ENDIF.
I would still like to know if there is a config way of doing this.
Thanks
Tom