Calculates a checksum for a string that contains a number.
CheckNumber :=STRCHECKSUM(String[, WeightString][, Modulus]) 
Parameters
 String
 Type: Text constant or code This string contains the number for which you want to calculate a checksum. You can only enter the numeric characters 09 in this string. If you enter anything else, a runtime error will occur. If String is empty, 0 is returned.
 WeightString
 Type: Text constant or code This string contains numbers that you want to use as weights when calculating the checksum. The default value is a string that contains STRLEN(String) '1'characters. You can only enter the numeric characters 09 in this string. If you enter anything else, then a runtime error occurs. If String is longer than WeightString, then a string is concatenated that contains STRLEN(String)  STRLEN(WeightString) '1'characters to the end of WeightString. If WeightString is longer than String, then a runtime error occurs.
 Modulus
 Type: Integer The number that you want to use in the checksum formula. The default value is 10.
Property Value/Return Value
Type: Integer
The checksum, which is calculated using this formula:
Example
This example shows how to use the STRCHECKSUM function to calculate a checksum.
This example requires that you create the following variables and text constants in the C/AL Globals window.
Variable name  DataType  Length 

StrNumber  Text  30 
Weight  Text  30 
Modulus  Integer  Not applicable 
Text constant  ENU value 

Text000  The number: %1\ 
Text001  has the checksum: %2 
Copy Code  

StrNumber := '4378'; Weight := '1234'; Modulus := 7; CheckSum := STRCHECKSUM(StrNumber, Weight, Modulus); MESSAGE(Text000 + Text001, StrNumber, CheckSum); 
The formula is:
(7  (4x1 + 3x2 + 7x3 + 8x4) MOD 7) MOD 7=0
The message window displays the following:
The number: 4378
has the checksum: 0
Example
This example shows how to use the STRCHECKSUM function to calculate a modulus 10 checksum for a bar code.
The STRCHECKSUM function can be used to calculate checksums for 13 and 8digit European Article Number (EAN) and EANcompatible bar codes such as a Universal Product Code (UPC) or Japanese Article Number (JAN).
A 13digit EAN code has the following format:

The 12 digits in positions 13 to 2 are used to calculate the checksum at position 1.

Starting with position 2, all even values are totaled. The result is then multiplied by three. This value is called Even.

Starting with position 3, all odd values are totaled. The result is called Odd.

Total=Even + Odd.

The modulus 10 checksum is then (10  Total MOD 10) MOD 10.
This example requires that you create the following variables and text constants in the C/AL Globals window.
Variable name  DataType  Length 

StrNumber  Text  30 
Weight  Text  30 
Modulus  Integer  Not applicable 
Text constant  ENU value 

Text000  The EAN code: %1\ 
Text001  has the checksum: %2 
Copy Code  

StrNumber := '577622135746'; Weight := '131313131313'; CheckSum := STRCHECKSUM(StrNumber, Weight); MESSAGE(Text000 + Text001, StrNumber, CheckSum); 
The message window displays the following:
The EAN code: 577622135746
has the checksum: 3