HOWTO: Check is a field is mapped to a field on a Map

If you add a new field on a Map, but you cannot map the field to all tables you need to check, on map common methods, if the field is mapped on the table you are going to update, if you don't to it the system raise an error.

For to this you can use this function:
https://msdn.microsoft.com/en-us/library/global.mappingexists.aspx

An example of use is:

if (Global::mappingExists(tableNum(SalesPurchLine), this.TableId, fieldNum(SalesPurchLine, MYFIELD)))
  this.MYFIELD = AVALUE;


Check MSDN docs for details of the mappingExists global function