Clearing BegBalance data from a Pipeline in ASO cube

Summary:

Hello,

A pipeline calls a groovy script to clear data where start and end periods are set as runtime prompts. The groovy script works well when running as a standalone script.

When including it in a pipeline, I get the error when I specify BegBalance in the start period runtime prompt.

If I specify Jan-26 as the start period, the pipeline runs without any issues.

For the start period, I tried BegBalance, BegBal-26 and BegBal, but I get the same error.

BegBalance is what is defined in the Global Mapping, and is mapped to BegBal-26.

What am I missing?