The taxable amount in detail tax lines (zx_lines table) is distributed as below

The taxable amount in detail tax lines (zx_lines) showing as below:

No. Tax Amount Taxable Amount
1            390         7792
2            117          2344
3            38            759
4            117          2344

The taxable_amount is not same amount with invoice_line amount, how it can be distributed as the above?

For example:
A invoice has 4 lines as:

No.   Amount
1      4200
2      4200
3      4500
4      1000

More details, please review the aplist file.