Should we use Lock when we use FM change_document

Hello All,
I have a requirement to change all the open items assignment field ( ZOUNR) for a particular company code and fiscal year and also for a particular G/L account.
so i have found a FM that will update the Dcoument related information change_document , now what i want to know is whether to use this FM between ENqueue and Dequeue.
here is my logic
i will select all the documents with open item from for a particular Comp code, fiscal year G/L account and Posting date. after keeping all the data into an internal table it_final. i want to make use of the FM change_document.
so should i lock the updation using enqueue and dequeue. or can i directly pass the internal table to the FM wihtout using the Lock mechanism.
Thanks in advance

Hi,
You must to use the Lock mechanisam when you update the Table. For example you have selected the record that record you want modify . If some one is deleteing the record you will not able to modify. If you lock the table no will get the change access. So you can easily modify using the lock mechanism.
Regards
Thiru

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