Other fixes include:
The reference in install.txt to adding
Add at the end just before ?> :
// include balance_format class and create an instance
// Account Balance Modif
require(DIR_WS_CLASSES . 'balance_format.php');
$balance_format = new balance_format();
// End Account Balance Modif
to catalog\admin\customers.php is incorrect, it really means catalog\admin\application_top.php
AND
In file catalog\admin\includes\languages\english.php (and all 'language'.php ie french, german...)
Add at the end just before ?> :
// added for account balance mod
define('ENTRY_ACCOUNT_BALANCE', 'Account Balance');
define('CATEGORY_ACCOUNT_BALANCE', 'Account Balance');
define('TABLE_HEADING_ACCOUNT_BALANCE', 'Account Balance');
needs a small bug-fix in customers.php becuase customers php is calling a variable "TABLE_ACCOUNT_BALANCE" for the title of the column.
Instead I just added
define('TABLE_ACCOUNT_BALANCE', 'Account Balance');
And so far it all looks good and works from the admin side.
Still testing on the customer side!
A.