If the document to be processed has already been partially or entirely translated using Translator's Workbench and changed after that, it may happen that target segments in the translated document differ from those in translation memory. In this case, you can decide whether the translation memory or the document should be updated, or if changes should be ignored.
The Update Changed Translations group box applies only to documents that meet the following requirements:
· The documents have already been partially or entirely translated with Translator's Workbench. As a result, they contain translation units (hidden source text with target text translation).
· The translation memory used for the Translate function is the same as the one used for the previous translation.
· Changes were made to translation units in the document without using Translator's Workbench, which means that these changes have not been rendered in the corresponding translation memory. As a result, some translation units in the document differ from those in translation memory.
In this case, you can decide what should happen to the pre-translated document and the corresponding translation memory by selecting Don't, Update TM, and Update Document as required.
Taken From: Translator's Workbench Help, (c) 2004 TRADOS Incorporated.