While installing any AIP over an existing installation, please ensure that the existing application installation is uninstalled.
Please follow the following steps to ensure the same:
1. Create a new 10.1.2 AIP as you have done and create a new package for the same.
2. Unlink the existing 10.1.1 AIP package from your OU.
3. Link the newly created 10.1.2 AIP package to the same OU.
This will ensure that the existing installation is removed prior to installing the new AIP (as long as you have selected the "Uninstall this application when it falls out of the scope of management" checkbox while creating the package.
The following document has more information regarding the same:
Hope this heps
Moving this discussion to the Enterprise Deployment forum.
Thanks for the input. I have used the same document but ther is nothing mentioned about removing/uninstalling the previous version. Adobe did not do well with those patches at all. Currently I am doing the same as you have advised:
1) Removing the existing installation
2) Populating the new one
But it is not convenient and Adobe's manual claims you can reuse the AIP, but it does not work.
Many thanks for the input.