# Configure Purchase and Inventory Behavior

### How to Configure Purchase and Inventory Behavior in Muhasib ERP

### Overview

This guide will help you configure company-wide purchase and inventory rules with a recoverable verification plan.

New purchases, stock movements, returns, POS activity, inventory calculations, and reports may use the new rules. Source alone does not prove whether historical values are recalculated.

### Who can do this

You need access to Global Configurations and business authorization for stock valuation, costing, purchase tax, and item lifecycle policy.

### Before you start

Back up the database. Record current settings and compare and confirm stock, item costs, inventory ledger, payables, purchase tax, and General Ledger.

<div id="bkmrk-%F0%9F%9A%A8-importantmake-sure" style="border-left: 4px solid #dc2626; background: #fef2f2; padding: 12px 16px; margin: 15px 0; border-radius: 4px;">Before saving, check that the correct company is open and that you have permission to complete this task.</div>### Where to find it

Back Office → Settings → Application/Global Settings → System Settings and Purchase Settings.

### Configure Purchase and Inventory Behavior

#### Step 1: Select the approved inventory-management/calculation method

#### Step 2: Configure quantity decimal places and item-batch behavior

#### Step 3: Configure whether item cost is recalculated or changed by Purchase/GRN

#### Step 4: Configure purchase tax, visible tax controls, and whether tax uses

Configure purchase tax, visible tax controls, and whether tax uses item selling price.

#### Step 5: Configure display of selling price and selling-versus-cost difference

#### Step 6: Configure allocation of other purchase discount across line items

#### Step 7: Review item deletion after transactions, automatic barcode, MRP, multiple images,

Review item deletion after transactions, automatic barcode, MRP, multiple images, and positive selling-price enforcement separately.

#### Step 8: Save and reopen affected forms

### Check your work

In a snapshot, create a small Purchase/GRN and sale/return sequence. Compare and Confirm item cost, stock by location/batch, inventory ledger, purchase tax, payable, COGS, and General Ledger.

<div id="bkmrk-%F0%9F%92%A1-tipcheck-the-saved" style="border-left: 4px solid #2563eb; background: #eff6ff; padding: 12px 16px; margin: 15px 0; border-radius: 4px;">Take a moment to check your work before closing the window. This small check can save time later.</div>### If something goes wrong

- Do not change costing methods to repair a single wrong item.
- If historical reports move unexpectedly, restore and escalate before production use.

### Related guides

- [Configure POS Behavior for a Company](https://docs.muhasiberp.com/link/189)
- [Create a Purchase](https://docs.muhasiberp.com/link/378)
- [Create an Inventory Adjustment](https://docs.muhasiberp.com/link/291)
- [Configure Accounting Settings](https://docs.muhasiberp.com/link/230)

### What to do next

<div id="bkmrk-%E2%9C%85-next-actioncontinu" style="border-left: 4px solid #16a34a; background: #f0fdf4; padding: 12px 16px; margin: 15px 0; border-radius: 4px;">[**Configure POS Behavior for a Company**](https://docs.muhasiberp.com/link/189).</div>