Your instructions snagged at using a date after transactions.  I've attached before & after reports of my attempt to follow your instructions.  Without impacting vendor invoices which I already marked down I wonder if on 3/16/21 I could post somehow:

1200H  -387250 units    -$874684.80

             +387250            +$.00

1400H  -25980   units    -$74302.80

             +25980             +$.00

Liz