Rule Target field: XXXXX group: 01 standard group: Conversion type missing

One of the error which we face rarely at design phase of transformations.I thought to make document which will be helpful to us.

Error : Rule (Target field: DB_DAY03 group: 01 standard group): Conversion type missing.

Situation:

We mapped a source field(ECC field) which holding amount to BW Target field DB_DAY03(Amount in INR)

At Transformation levels we mapped WAERK(currency) to DB_DAY03. While checking the transformations we got the below information and error.

Error:

While checking rule details, there is mandatory field conversion type which was blank.

My doc currency have stored all currency amounts, but in bw side we defined DB-DAY03 amount in Fixed INR.

When we are using fixed currency in bw side like above, at transformation levels no need  any conversions. so i removed the conversion type and activated the transformations. it went fine with out any error.

While removing conversion type we will get below pop up message, to continue, click on yes and activation will go without any error.

This kind of error occurs with currency/units. When we defined as bw key figure  with  fixed unit/currency , at transformation levels no need to map source currency/units to respective bw key figure. otherwise  it leads to above error.

If we need to store same source currency/units then at respective bw  key figure need to define with 0CURRENCY/0UNITS respectively.

Thanks reading.

Raman