"SQL0461N A value with data type "SYSIBM.XML" cannot be CAST to type "SYSIBM.VARCHAR". SQLSTATE=4 (60692)

When trying tochange a table column from type XML to VARCHAR(20000), Toadgenerates the insert below:

Insert (into temptable) with CAST(RESULT AS VARCHAR(20000).

However DB2 cannot cast XML into VARCHAR, so the following errorappears:
SQL0461N A value with data type SYSIBM.XML cannot be CAST to type SYSIBM.VARCHAR. SQLSTATE=42846.

Why does Toad generate the insert instead of displaying a message saying that this is not possible?

WORKAROUND:
None

STATUS:
Waiting for fix in a future release of Toad For DB2