Adding a colour picker lookup to an AX form

Here’s a quick and easy way to add a colour picker lookup to an AX form.

I’ve seen a number of different ways to add colour picker support to an AX form, but so far, this has been the easiest.  It is not ideal, because the colour picker opens up as a dialog window, something which can’t be easily worked around without resorting to using custom ActiveX or .NET controls.

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Filtered form reference group lookup

Dynamics AX 2012 introduces built-in support for resolving and looking up linked records based on reference record IDs.

When adding a reference record ID field to a form, AX will add a reference group control instead of the reference record ID, and will show a selected set of fields from the referenced table.  See the posts about tree lookups for an example.

The reference group control also does lookups into the referenced table for selecting a new value.  However, by default this lookup is not filtered and will show all records in the referenced table.  Adding filtering is quite easy to do and it follows a similar pattern as regular table lookups.

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Too many joins in query

In Dynamics AX 2012, if you are running a query with too many joins you can get an error or warning message saying “The number of joins in the statement is XX.  This exceeds the maximum of 26.  Turn on exception for this warning to see the call stack.”

So what is this, and what can you do about it?

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Implementing checkpointing in long-running updates

Occasionally we need to run updates or inserts of large numbers of records, something which has this nasty habit of taking out locks that will prevent other sessions from updating or inserting in the same tables.  Also, if we terminate such an operation, we’ll have to start all over again from the beginning, wasting a lot of time.

Luckily, with Read Committed Snapshot Isolation which is supported by AX, readers will not be blocked by writers, but writes will still be blocked by other writes.  Once SQL Server escalates the row-level locks to table-level locks things start to go downhill rather quickly, and as we’re pretty much guaranteed not to have an outage window in which to run the update operation, someone is going to be on the phone soon.   Quite soon…

The solution is to break the operation into smaller transactions.

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Debugging .NET code called from Dynamics AX

From time to time it is necessary to develop custom .NET code and call it from Dynamics AX.  It could be that you already have the .NET code to do what you need and you don’t want to reimplement the functionality in X++, or what you are trying to do is too complex to do directly in X++.

One common situation is where you need to write a wrapper around some operating system functionality or web service to expose a much simpler API to AX.

This works, and AX has good support for calling .NET code through it’s .NET interop framework.  One thing that does become more complicated is debugging, but once you know how it is actually quite easy.

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