Pass paramater to a form (or SubForm) using RUNMODAL or RUN

There are a few ways to pass a parameter to a form. The most common is to define a variable of type FORM create a function in that form and call the function to set parameters.

There are a few cases where it is not possible or not ideal to do this. For example calling a form from a button on another form, or a SubForm. Lets say you need to pass a value from the sales header to the sales line. Or you want to open the customer card from a sales header but pass a parameter across. You can do this using a single instance code unit, but a simpler way is just to add the parameter to the filters that are set on the form.

So lets say the Sales Header has FieldX and you want the value in this transferred to the Sales Line SubForm. Create the same field in the Sales Line table. Set the propertied identical, EXCEPT, set the Class to FlowFilter.

Now in your SubForm link properties set the two fields to link to one another. Now in the sales line sub form you can get the parameter by using MyValue := Getfilter(FieldX);

You could also do this if you want the value on the customer card when you press Shift+F5 form the sales header.

The solution is a bit of a hack, but simple, and also if you just need to view the value, then you don't even need access to code, so handy for end users with just the Table and Form designers.