Rigga has provided some very sound advice.
I believe this requirement was introduced into 145.A.45 following the serious incident that occurred to an Excalibur A320 during in a line maintenance non scheduled flap change. The AAIB report published in 1994 is comprehensive and provides a great deal of background information that 145 AMOs could refer to when preparing their own procedures. It is well worth a read to be reminded of the traps and pitfalls that await the unwary or unprepared.
http://www.aaib.gov.uk/cms_resources...5%20G-KMAM.pdf
Perhaps you could use this report for continuation training and if the AMO staff are not convinced and prepared to play ball in accordance with your procedures then perhaps they should be looking for a new job.
In addition the CAA published an Airworthiness Notice on the subject which is now included as appendix 5-2 in CAAIPs.