Understanding Cash Flow , what is "Adjustments for changes in working capital"?

I am reading a companies AR and this is what it says .

Cash Flow from Operating Activites


Net Profit before Tax and Extrordinary Items 500 Million

Adjustment for Non Cash Items
Depreciation
Interest Charged
Proft Loss on Sale of assets etc 200 Million

Adjustment for changes in working capital
Inc /Dec in sundry debtors
Inc / Dec in current liabilities
Inc / Dec in Loan
Inc / Dec in Inventories (1500) Million


Net is -800 Million

Now what is the meaning of this Adjustments for working capital , how come the company which makes profit has a negative cash flow from operating capital , what is the meaning of the high negative value for inventory ?
1 second ago - 4 days left to answer.

may be unsold goods, damaged goods, theft , loss on transit etc. depends on the nature of company.
sundry debtors - bad debt
Loan - bad loan