We are using ATG 10.1.2. We have added view mapping repository definition to increase input field length for one of the item-descriptors property. This change is reflected in CA (Content Administration), but not in Merchandising (Flex UI).
is Merchandising (Flex UI) not using View Mapping definition?
View mapping is still being used but customizing the new Flex based Merchandizing UI is not that simple as just changing in JSPs and requires some understanding of ActionScript and Flex SDK. You can login to MOS and refer to this knowledge base document: Customizing ATG Merchandising 10.1 (Doc ID 1467371.1)