crm vtiger modify and make arrangements

Avg Bid (USD)
Project Budget (USD)
$30 - $250

Project Description:
need to make some changes in vtiger crm.
Numbering in Invoices Module

need to work with 2 types of invoices invoice example where A and B bill for selection according to the type of customer, the invoice must select A or B with a separate invoice and correlative numbering

2nd Purchase Order with custom field COST PRICE WITHOUT VAT

First page of the forum: description and code
Second page of the forum: correction)
Page 3rd Forum application to version 5.4)

this is for the PURCHASE ORDER Provider is generated with the new field of COST PRICE WITHOUT VAT from any entity in which a purchase order is generated ...

Skills required:
CRM, MySQL, PHP, vTiger
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