problems with ALLOC and REALLOC

We attempted to use ALLOC and REALLOC opcodes on a array declared with a DIM of
100 elements, so that it could be resized as needed.
The array was declared with a basing pointer so the memory for the array would
not be allocated until the ALLOC opcode was used.
When the array was allocated with a size less than the size for the maximum
number of element using the ALLOC opcode. The full amount of memory for the
array was allocated at 100 elements instead of the specified size.  We were able
to assign values to elements outside of the range that was allocated etc..
When following the code below the first time the value for arySize = 10
(2bytes * 5)
When following the code below the second  time the value for arySize = 20
Also, since the whole array was allocated, REALLOC had no effect.
Any thoughts on why ALLOC/REALLOC would not work as indicated?
We are at V4R3 O/S level.

Thanks in advance.
Brian Ellis



 *resizable array for WMS order types
DpOrdTypAry      S               *
D ordTypAry       S              3P 0 DIM(100)
D                                           based(pOrdTypAry)
DarySize             S       10i  0
D aryCntr         S             10I 0 INZ(1)


C    AllocAry      BegSr

C                  Eval      arySize = %size(OrdTypAry) * 5
C                  Alloc     arySize       pOrdTypAry


C    ResizeAry     BegSr

C                  Eval      arySize = arySize + (%size(ordTypAry) *  5)
C                  ReAlloc   arySize       pOrdTypAry





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