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Weird experience with tablemaps and layers

Today we experienced something weird in AX2009.

We have installed an application module in the AX in the VAR and VAP layers, and are making CUS-layer modifications that are customer specific.
In the module a tablemap is used to be able to implement code once but for use on several tables.

However we experienced a run-time error when we ran a form, that called the code on the table map. The kernel complained about a field having id 0.

We searched high and low but couldn't find any reason for the run-time error that occurred. We then tried making a cus-layer edition of all the mappings on tablemap and voila, no more run time error.

Weird. :0S
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