A Devonport school teacher who was kicked out of Tasmania's state super fund for a decade when she shifted to part-time work after her pregnancy has won a partial court victory.

The Retirement Benefits Fund (RBF) dropped the teacher as a scheme contributor when she switched to part-time hours as a result of her difficult pregnancy.

Lawyers for the Port Sorell woman argued at a two-day hearing last October that the decision unfairly cut thousands of dollars' worth of pension benefits that she would otherwise have been entitled to.

Although the teacher was re-admitted to the scheme in 1999, the fund board did not backdate her benefits to 1989.

The size of pensions paid out by the RBF - now known as the Superannuation Commission - is calculated based on the number of days and years the

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