Volitional Memory Error

We may define volitional memory as the memory of a will or decisive encoding to do an action.

Let's suppose:
1. At time x, Oscar has the goal A and decides to reach it by act B
2. At time y, Oscar decides to change the plan and reach A by act C
OR,
At time y, Oscar decides to change the plan and reach D by act C
3. However, at time z, Oscar only remembers #1 and goes about reaching goal A by act B.

Only later does he realize that there was a memory error.

This may happen when at time z, Oscar may have another engagement that perhaps eats up the memory space of the most recent time y, and the brain is forced to retrieve elements of time x in order to facilitate action.

This is just an hypothesis, though this form of memory loss is a reality.

Similarly,
1. At time x, Oscar knows a set of decision things A.
2. At time y, Oscar knows a set of decision things B in addition to set A.
3. At time z, Oscar only remembers A.

Any ideas?