[fix] If precision > 6, use Decimal(21,9) to allow for 12 digits before the decimal dot like in (18,6)

frappe/model/db_schema.py

@@ -575,7 +575,7 @@ def get_definition(fieldtype, precision=None, length=None):
 
 	if size:
 		if fieldtype in ["Float", "Currency", "Percent"] and cint(precision) > 6:
-			size = '18,9'
+			size = '21,9'
 
 		if coltype == "varchar" and length:
 			size = length