Why did my adjustment asset lines not get transferred into Oracle Assets?

Adjustment asset lines, by definition, are created and applied from an originating project asset line.

Project asset lines are called asset source lines in Oracle Assets. These source lines must be successfully posted in Oracle Assets by running the Post Mass Additions process.

After the Post Mass Additions process runs successfully, Oracle Projects must run the Update Assets Information from Oracle Fusion Assets process to establish the relationship with all newly created Oracle Assets assets with the originating Projects assets. This relationship–or connection–enables adjustment project asset lines to be assigned to the original asset lines in Projects.

If the connection between the Oracle Assets asset and Projects asset isn't made, it's not possible to create adjustments to Oracle Assets assets because Projects will not have corresponding asset records to which they can allocate these adjustments.