FRM-30457: Warning: Maximum Length ignored for character-datatype subordinate mirror itme

Hi fellas,

Sometimes we used Copy Value From Item property and Synchronize With Item property in oracle forms to connect separate items in same form. 

Just imagine we have two items named ITEM1 and ITEm2 and we need to use number of properties like Data Type, Maximum Length, Required property ,  Highest Allowed Value,..etc... of ITEM1 on ITEM2. In these kind of scenario, we can use Copy Value From Item property and Synchronize With Item property to apply them. 

For apply this you have to keep both items in the same data type. 

FRM-30457: Warning: Maximum Length ignored for character-datatype subordinate mirror item will appear if you assign a value for Maximum Length property in child item (in this example it's ITEM2. ITEM1 is the master item.). 

If we assign a value to Copy Value From Item property to some item, we cant assign a value to the Maximum Length property of that item because it refers the master item and will take those properties from that master item. Therefore we have to keep Maximum Length property as 0 for child item.

FRM-30443: Warning: Highest Value Allowed ignored for subordinate mirror item
and
FRM-30444: Warning: Lowest Value Allowed ignored for subordinate mirror item
will be appear if you assign values for Lowest Allowed Value and Highest Allowed Value properties of the child item. You should keep those properties (Lowest Allowed Value / Highest Allowed Value) empty for child item to avoid those above warnings.