We might get this error while trying to access a ReadWrite variable within Script Component outside Post Execute.
Here we were using it within ProcessInputRow method
As per the official documentation – the reason for this error is because ReadWriteVariables are only available inside PostExecute method for improved performance and minimizing locking.
Continue Reading Nishant Rana’s Article on their blog
The collection of variables locked for read and write access is not available outside of PostExecute error in SSIS – Nishant Rana’s Weblog
Blog Syndicated with Nishant Rana’s Permission
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