Configure button in applet "ISS Promotion Edit UI Detail List Applet" produces errors (Doc ID 1077415.1)

Symptoms

After adding a number of products to a promotion in an order, the following issue arose in a customer environment:
If you click on the Configure button in applet "ISS Promotion Edit UI Detail List Applet" for a customizable product, the eConfigurator UI is not started. However it seems to be started in the background and therefore produce a lot of follow-up issues:
On subsequent attempts to start the product configurator in applet "ISS Promotion Edit UI Detail List Applet",

- either the product configurator produces error messages when the user tries to save the configuration, such as
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Error invoking service 'SIS OM PMT Service', method 'GetInstance' at step 'Get Instance'(SBL-BPR-00162)
Complex Object instance is not loaded.(SBL-CFG-00156)
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Error invoking service 'CUT eSales Order Entry Toolkit Service', method 'Gotoview' at step 'Go to Orders View'(SBL-BPR-00162)
Invalid operation when not executed.(SBL-DAT-00471)
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Error invoking service 'SIS OM PMT Service', method 'Synchronize' at step 'Sync Order Line Item'(SBL-BPR-00162)
Insert operation on integration component 'Line Item' failed because a matching record in business component 'MACD Order Entry - Line Items' with search specification '[Integration Id] = "1-1V38T"| was found.(SBL-EAI-04383)
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Cannot load active Business Component.(SBL-ORD-00116)
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- or the product configurator doesn't start at all and there is an error triangle in the bottom left-hand corner of the MS Internet Explorer window; double clicking the error triangle will pop up the following error details:
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Line: 1
Char: 2
Error: The object does not support this property or method.
URL: http://localhost/ecommunications_deu/start.swe/SWECmd=GetViewLayout&SWEView=ISS%20Promotion%20Edit%20UI%20View%20-%20Order%20Sales/SWEVI=&SWEVLC=0-1Siebel%2bPower%2bCommunications_43%257c1268352033%257c0_0_21215_000_L
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Cause

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