conditional accumulator in a loop

The Challenge: I have a situation with a trading partner where I need to sum the SAC 5.0 Amount values and place that value into a UFD field.  Below is an example:

An 850 has the following:

SAC*A*H000****3*.71*****02

SAC*A*C300****3*1.25*****02

SAC*A*I170****3*4.5*****02

I need to sum the 3 amounts, .71 + 1.25 + 4.5 and place the result 6.46 into a field in the UFD.

The Solution 1: There are three steps needed to do this: 

1) Create a numeric work field, SACTOTAL with enough digits to contain the possible accumulated total of the SAC segments. 

2) While reading the SAC segment, add this mapping instruction source: SACTOTAL Add SAC 5.0 to target: SACTOTAL. 

3) While reading the SAC segment, Map SACTOTAL to your UFD field. (make sure that #2 is before #3)

The Solution 2: If there is a possibility of the SAC 1.0 to be "C"-charge mixed with "A"-allowance, you need to condition this because this is a numeric sign: 

i) Define condition on SAC 1.0: =A =C. 

ii) Select conditions for mapping: when SAC 1.0=A. 

iii)  While reading the SAC segment, add this mapping instruction source: SACTOTAL Subtract SAC 5.0 to target: SACTOTAL plus Map SACTOTAL to your UFD field. 

iv) Select conditions for mapping: when SAC 1.0=C. 

v)  While reading the SAC segment, add this mapping instruction source: SACTOTAL Add SAC 5.0 to target: SACTOTAL plus Map SACTOTAL to your UFD field.

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