AP45.3, AP146, and AP245 - Added a field for withholding amount on AP45.3

The Withheld Amount field is added in Non-AP Reportable Income Adjustment (AP45.3) to record any amounts that are withheld from a payment and that are required to be reported to Internal Revenue Service (IRS). This is applied only for records specified manually on AP45.3.

Amount added or maintained in the Withheld Amount field is populated as Withholding Amount in Reportable Income Report (AP245) and as Federal income tax withheld (Box 4) in the 1099 Tape Creation (AP146) generated Tape and Print (incform) output.

As an enhancement to the database, the WITHHELD-AMT is added as a new field for withholding amount in the APRPTBLINC file.

Related JT JT-1549709: Added a field for withholding amount on AP45.3