This line will not work as written. Your database is not named Target. The field in your database that matches is probably not named Key.
vRS = @XResultSetSearch("policy.db", "Target", SEARCH_MODE_AND, SEARCH_SYNTAX_QA, "!Key=" + ASCII0000)

To find the right names:
1. Open Policy.db in Designer. 
2. Open the Policy Form.
3. In the Property Viewer, from the View Setting For dropdown, select Database. The Database Name is what you want in place of "Target" as the second argument.
4. Click on the element on the form which has the matching key value.
5. In the Property Viewer, from the View Setting For dropdown, select Selected Elements. Click the Other tab. The Bound To is what you want in place of "!Key" in the last argument.

Fix that line and post it here. If it looks right, then I'll tell you what to do next.