Solution : https://service.sap.com/sap/support/notes/621436 (SAP Service marketplace login required)
Key words : 
solution open function group crm_crmm_pr_salesa_ui, field crmt_crmm_pr_salesa_ui-price_product, field crmt_crmm_pr_salesa_ui-price_product_tx, screen conflicts reason, screen conflicts, sizing conflicts, field 'in_sales_unit_or_base_unit_of_measure', field length, 'scrollbl' field, product maintenance
Related Notes : 
       
| 634869 | SAPKU40001: Support Package 01 for CRM 4.0 |