In oracle form not to allow cursor to move ahead if value is not entered

I have to modify an existing form in which the cursor sould not move ahead if no value is entered in the field.There are many items for that block.If no value is entered for a particular ITEM then the cursor should not move ahead on pressing the Tab key.
Please let me know what property needs to be set for this thing to work.

Hi
Ok.So I have a text item...and i want the cursor not to move ahead if it is NULL.
So which property should I change and where would I fiind this property?As i previously mentioned , if it is a not null db item the item's property > Required is set to > yes
but if it is not a not null db item then u have 2 option set the item's property > Required is set to > yes
or u can use the following code in When-Validate-item Trigger
IF :BLOCK_NAME.UR_ITEM IS NULL THEN
MESSAGE ('Pls Enter this Field it is Required');
RAISE FORM_TRIGGER_FAILURE;
END IF;
Ok 1 more thing.Suppose i dont want the cursor to move back to the first field by pressing TAB
after coming to the last field..what should be done..?u have 2 options u can choose which depends upon ur needs
If ur block is Master Block and u want to navigate to a Detail accordingly
Pls use the block's property > Navigation Style > change data block
But If ur block is detail Block and u want to navigate to next record accordingly
Pls use the block's property > Navigation Style > change Record
Hope this helps...
Regards,
Abdetu...

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In oracle form not to allow cursor to move ahead if value is not entered

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