POSDM Error : Base Unit of measure is not updated in POS Workbench

Dear Experts,

Material group and Base unit of measure is not updating in the POS Workbench. SO the article is in error.

I have check the Unit of measure for that same article in ECC , it is maintained as 'PC'.

And also checked in the RSA1 in BW , the Base unit is 'PC' .

but it is not reflecting in Base Unit of Measure field in POS Workbench.but Sales Unit is reflecting as 'PC'

I am getting the error as " Sales Unit of Measure PC does not match material XXX' 

Kindly help me.

Thanks & Regards

Rakesh