When we convert from CAL to AL, we move from one development platform to another, and the two are not 100% identical. As a result, there may be some cases where the CAL solution cannot be fully converted.

A few examples of this are as follows:

• The older C/SIDE development client allowed you to do things that the AL platform no longer does.
• Due to the nature of the Business Central AL extension architecture, certain modifications made in CAL are no longer allowed.

When we encounter these scenarios, the conversion tool marks them and, at that point, the only option is for a developer to review and handle them accordingly.

The first thing to do when tackling these things is to ask yourself whether the change is really needed. Enhancements in the platform and the product may dictate that the change is no longer needed. In the event that you need the change in your AL application, you may need to alter it to use the new AL capabilities, or you may simply need to redesign a new solution that works within the boundaries of what a Business Central application can do.