[FIX] account: added _columns={} in osv.memory to prevent using another wozard's columns
[FIX] stock: Merge Orders wizard in Purchase Order tree view does not allow to merge the orders showing warning for Incorrect red fields, OPW 574682
[MERGE] [FIX] account: added _columns={} in osv.memory to prevent using another wizard's columns
[MERGE] [FIX] stock: define empty columns, courtesy of Paulius Sladkevičius (komsas)