You ask a good question, Tracy -

It may surprise you to learn that the SetNull() PowerScript function actually makes NO content changes to the memory allocated to a variable, array or object!

PB keeps track of the null/not null status of every variable, array and object separately from its contents (PB keeps track of what I like to think of as "descriptor blocks"). Note that an individual structure cannot be set to null, but an array of structures can. When the SetNull function runs, it turns the "Hey, I'm null!" indicator in the descriptor block on but makes no change to the memory occupied by the variable, array, or object. If there existed a "SetNotNull" PowerScript function, you'd be able to access the contents as if nothing had happened after using it.

What really makes the difference when resetting an unbounded array is having another, empty array, such as the istr_Null array in Chris' code snippet. Assigning an empty array to the "real" array is what actually resets the size/memory/bounds of the real array.

When coding a situation such as you have, I like to name the empty array "xxxx_empty_array[]" when it's declared, then the code to reset/clear the array becomes quite obvious. For example:

s_document lstr_empty_document_array[]

istr_documents = lstr_empty_document_array

Regards, John