Validation functions
C/AL includes a number of utility functions designed to facilitate data validation or initialization. Some of these functions are as follows:
TESTFIELDFIELDERRORINITVALIDATE
TESTFIELD
The TESTFIELD function is widely used in standard NAV code. With TESTFIELD, we can test a variable value and generate an error message in a single statement if the test fails. The syntax is as follows:
Record.TESTFIELD (Field, [Value])
If a Value is specified and the field does not equal that value, the process terminates with an error condition and an error message is issued.
If no Value is specified, the field contents are checked for values of zero or blank. If the field is zero or blank, then an error message is issued.
The advantage of TESTFIELD is ease of use and consistency in code, and in the message displayed. The disadvantage is the error message is not as informative as a careful developer would provide.
The following screenshot of the TESTFIELD function usage is from Table 18 - Customer...
